diff --git a/examples/chart_data_labels.py b/examples/chart_data_labels.py
new file mode 100644
index 000000000..378481dc6
--- /dev/null
+++ b/examples/chart_data_labels.py
@@ -0,0 +1,240 @@
+#######################################################################
+#
+# A demo of an various Excel chart data label features that are available
+# via an XlsxWriter chart.
+#
+# Copyright 2013-2020, John McNamara, jmcnamara@cpan.org
+#
+import xlsxwriter
+
+workbook = xlsxwriter.Workbook('chart_data_labels.xlsx')
+worksheet = workbook.add_worksheet()
+bold = workbook.add_format({'bold': 1})
+
+# Add the worksheet data that the charts will refer to.
+headings = ['Number', 'Data', 'Text']
+
+data = [
+    [2, 3, 4, 5, 6, 7],
+    [20, 10, 20, 30, 40, 30],
+    ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun'],
+]
+
+worksheet.write_row('A1', headings, bold)
+worksheet.write_column('A2', data[0])
+worksheet.write_column('B2', data[1])
+worksheet.write_column('C2', data[2])
+
+#######################################################################
+#
+# Example with standard data labels.
+#
+
+# Create a Column chart.
+chart1 = workbook.add_chart({'type': 'column'})
+
+# Configure the first series with a polynomial trendline.
+chart1.add_series({
+    'categories': '=Sheet1!$A$2:$A$7',
+    'values':     '=Sheet1!$B$2:$B$7',
+    'data_labels': {'value': True},
+})
+
+# Add a chart title.
+chart1.set_title({'name': 'Chart with standard data labels'})
+
+# Turn off the chart legend.
+chart1.set_legend({'none': True})
+
+# Insert the chart into the worksheet (with an offset).
+worksheet.insert_chart('D2', chart1, {'x_offset': 25, 'y_offset': 10})
+
+#######################################################################
+#
+# Example with value and category data labels.
+#
+
+# Create a Column chart.
+chart2 = workbook.add_chart({'type': 'column'})
+
+# Configure the first series with a polynomial trendline.
+chart2.add_series({
+    'categories': '=Sheet1!$A$2:$A$7',
+    'values':     '=Sheet1!$B$2:$B$7',
+    'data_labels': {'value': True, 'category': True},
+})
+
+# Add a chart title.
+chart2.set_title({'name': 'Category and Value data labels'})
+
+# Turn off the chart legend.
+chart2.set_legend({'none': True})
+
+# Insert the chart into the worksheet (with an offset).
+worksheet.insert_chart('D18', chart2, {'x_offset': 25, 'y_offset': 10})
+
+#######################################################################
+#
+# Example with standard data labels with different font.
+#
+
+# Create a Column chart.
+chart3 = workbook.add_chart({'type': 'column'})
+
+# Configure the first series with a polynomial trendline.
+chart3.add_series({
+    'categories': '=Sheet1!$A$2:$A$7',
+    'values':     '=Sheet1!$B$2:$B$7',
+    'data_labels': {'value': True,
+                    'font': {'bold': True,
+                             'color': 'red',
+                             'rotation': -30}},
+})
+
+# Add a chart title.
+chart3.set_title({'name': 'Data labels with user defined font'})
+
+# Turn off the chart legend.
+chart3.set_legend({'none': True})
+
+# Insert the chart into the worksheet (with an offset).
+worksheet.insert_chart('D34', chart3, {'x_offset': 25, 'y_offset': 10})
+
+#######################################################################
+#
+# Example with custom string data labels.
+#
+
+# Create a Column chart.
+chart4 = workbook.add_chart({'type': 'column'})
+
+# Some custom labels.
+custom_labels = [
+    {'value': 'Amy'},
+    {'value': 'Bea'},
+    {'value': 'Eva'},
+    {'value': 'Fay'},
+    {'value': 'Liv'},
+    {'value': 'Una'},
+]
+
+# Configure the first series with a polynomial trendline.
+chart4.add_series({
+    'categories': '=Sheet1!$A$2:$A$7',
+    'values':     '=Sheet1!$B$2:$B$7',
+    'data_labels': {'value': True, 'custom': custom_labels},
+})
+
+# Add a chart title.
+chart4.set_title({'name': 'Chart with custom string data labels'})
+
+# Turn off the chart legend.
+chart4.set_legend({'none': True})
+
+# Insert the chart into the worksheet (with an offset).
+worksheet.insert_chart('D50', chart4, {'x_offset': 25, 'y_offset': 10})
+
+#######################################################################
+#
+# Example with custom data labels from cells.
+#
+
+# Create a Column chart.
+chart5 = workbook.add_chart({'type': 'column'})
+
+# Some custom labels.
+custom_labels = [
+    {'value': '=Sheet1!$C$2'},
+    {'value': '=Sheet1!$C$3'},
+    {'value': '=Sheet1!$C$4'},
+    {'value': '=Sheet1!$C$5'},
+    {'value': '=Sheet1!$C$6'},
+    {'value': '=Sheet1!$C$7'},
+]
+
+# Configure the first series with a polynomial trendline.
+chart5.add_series({
+    'categories': '=Sheet1!$A$2:$A$7',
+    'values':     '=Sheet1!$B$2:$B$7',
+    'data_labels': {'value': True, 'custom': custom_labels},
+})
+
+# Add a chart title.
+chart5.set_title({'name': 'Chart with custom data labels from cells'})
+
+# Turn off the chart legend.
+chart5.set_legend({'none': True})
+
+# Insert the chart into the worksheet (with an offset).
+worksheet.insert_chart('D66', chart5, {'x_offset': 25, 'y_offset': 10})
+
+#######################################################################
+#
+# Example with custom and default data labels.
+#
+
+# Create a Column chart.
+chart6 = workbook.add_chart({'type': 'column'})
+
+# Some custom labels. The undef items will get the default value.
+# We also set a font for the custom items as an extra example.
+custom_labels = [
+    {'value': '=Sheet1!$C$2', 'font': {'color': 'red'}},
+    None,
+    {'value': '=Sheet1!$C$4', 'font': {'color': 'red'}},
+    {'value': '=Sheet1!$C$5', 'font': {'color': 'red'}},
+]
+
+# Configure the first series with a polynomial trendline.
+chart6.add_series({
+    'categories': '=Sheet1!$A$2:$A$7',
+    'values':     '=Sheet1!$B$2:$B$7',
+    'data_labels': {'value': True, 'custom': custom_labels},
+})
+
+# Add a chart title.
+chart6.set_title({'name': 'Mixed custom and default data labels'})
+
+# Turn off the chart legend.
+chart6.set_legend({'none': True})
+
+# Insert the chart into the worksheet (with an offset).
+worksheet.insert_chart('D82', chart6, {'x_offset': 25, 'y_offset': 10})
+
+
+#######################################################################
+#
+# Example with deleted custom data labels.
+#
+
+# Create a Column chart.
+chart7 = workbook.add_chart({'type': 'column'})
+
+# Some deleted custom labels and defaults (undef). This allows us to
+# highlight certain values such as the minimum and maximum.
+custom_labels = [
+    {'delete': True},
+    None,
+    {'delete': True},
+    {'delete': True},
+    None,
+    {'delete': True},
+]
+
+# Configure the first series with a polynomial trendline.
+chart7.add_series({
+    'categories': '=Sheet1!$A$2:$A$7',
+    'values':     '=Sheet1!$B$2:$B$7',
+    'data_labels': {'value': True, 'custom': custom_labels},
+})
+
+# Add a chart title.
+chart7.set_title({'name': 'Chart with deleted data labels'})
+
+# Turn off the chart legend.
+chart7.set_legend({'none': True})
+
+# Insert the chart into the worksheet (with an offset).
+worksheet.insert_chart('D98', chart7, {'x_offset': 25, 'y_offset': 10})
+
+workbook.close()
diff --git a/xlsxwriter/chart.py b/xlsxwriter/chart.py
index bf8fc8e48..e95bdba8e 100644
--- a/xlsxwriter/chart.py
+++ b/xlsxwriter/chart.py
@@ -1173,6 +1173,8 @@ def _get_labels_properties(self, labels):
                 data_id = self._get_data_id(formula, label.get('data'))
                 label['data_id'] = data_id
 
+                label['font'] = self._convert_font_args(label.get('font'))
+
         return labels
 
     def _get_area_properties(self, options):
@@ -2682,7 +2684,7 @@ def _write_legend(self):
             self._write_overlay()
 
         if font:
-            self._write_tx_pr(None, font)
+            self._write_tx_pr(font)
 
         # Write the c:spPr element.
         self._write_sp_pr(legend)
@@ -2810,7 +2812,7 @@ def _write_title_formula(self, title, data_id, is_y_axis, font, layout,
             self._write_overlay()
 
         # Write the c:txPr element.
-        self._write_tx_pr(is_y_axis, font)
+        self._write_tx_pr(font, is_y_axis)
 
         self._xml_end_tag('c:title')
 
@@ -2820,7 +2822,7 @@ def _write_tx_rich(self, title, is_y_axis, font):
         self._xml_start_tag('c:tx')
 
         # Write the c:rich element.
-        self._write_rich(title, is_y_axis, font)
+        self._write_rich(title, font, is_y_axis, is_data_label=False)
 
         self._xml_end_tag('c:tx')
 
@@ -2848,7 +2850,7 @@ def _write_tx_formula(self, title, data_id):
 
         self._xml_end_tag('c:tx')
 
-    def _write_rich(self, title, is_y_axis, font):
+    def _write_rich(self, title, font, is_y_axis, is_data_label):
         # Write the <c:rich> element.
 
         if font and font.get('rotation'):
@@ -2865,36 +2867,7 @@ def _write_rich(self, title, is_y_axis, font):
         self._write_a_lst_style()
 
         # Write the a:p element.
-        self._write_a_p_rich(title, font)
-
-        self._xml_end_tag('c:rich')
-
-    def _write_rich_label(self, title, font):
-        # Write the <c:rich> element for data labels.
-
-        if font and font.get('rotation'):
-            rotation = font['rotation']
-        else:
-            rotation = None
-
-        self._xml_start_tag('c:rich')
-
-        # Write the a:bodyPr element.
-        self._write_a_body_pr(rotation, None)
-
-        # Write the a:lstStyle element.
-        self._write_a_lst_style()
-
-        self._xml_start_tag('a:p')
-
-        # Write the a:pPr element.
-        if font:
-            self._write_a_p_pr_rich(font)
-
-        # Write the a:r element.
-        self._write_a_r(title, font)
-
-        self._xml_end_tag('a:p')
+        self._write_a_p_rich(title, font, is_data_label)
 
         self._xml_end_tag('c:rich')
 
@@ -2924,13 +2897,14 @@ def _write_a_lst_style(self):
         # Write the <a:lstStyle> element.
         self._xml_empty_tag('a:lstStyle')
 
-    def _write_a_p_rich(self, title, font):
+    def _write_a_p_rich(self, title, font, is_data_label):
         # Write the <a:p> element for rich string titles.
 
         self._xml_start_tag('a:p')
 
         # Write the a:pPr element.
-        self._write_a_p_pr_rich(font)
+        if not is_data_label:
+            self._write_a_p_pr_rich(font)
 
         # Write the a:r element.
         self._write_a_r(title, font)
@@ -3046,7 +3020,7 @@ def _write_a_t(self, title):
 
         self._xml_data_element('a:t', title)
 
-    def _write_tx_pr(self, is_y_axis, font):
+    def _write_tx_pr(self, font, is_y_axis=False):
         # Write the <c:txPr> element.
 
         if font and font.get('rotation'):
@@ -3539,7 +3513,7 @@ def _write_d_lbls(self, labels):
 
         # Write the custom c:dLbl elements.
         if labels.get('custom'):
-            self._write_custom_labels(labels['custom'])
+            self._write_custom_labels(labels, labels['custom'])
 
         # Write the c:numFmt element.
         if labels.get('num_format'):
@@ -3583,7 +3557,7 @@ def _write_d_lbls(self, labels):
 
         self._xml_end_tag('c:dLbls')
 
-    def _write_custom_labels(self, labels):
+    def _write_custom_labels(self, parent, labels):
         # Write the <c:showLegendKey> element.
         index = 0
 
@@ -3602,12 +3576,30 @@ def _write_custom_labels(self, labels):
 
             if delete_label:
                 self._write_delete(1)
+
             elif label.get('formula'):
                 self._write_custom_label_formula(label)
-                self._write_show_val()
+
+                if parent.get('value'):
+                    self._write_show_val()
+                if parent.get('category'):
+                    self._write_show_cat_name()
+                if parent.get('series_name'):
+                    self._write_show_ser_name()
+
             elif label.get('value'):
                 self._write_custom_label_str(label)
-                self._write_show_val()
+
+                if parent.get('value'):
+                    self._write_show_val()
+                if parent.get('category'):
+                    self._write_show_cat_name()
+                if parent.get('series_name'):
+                    self._write_show_ser_name()
+            else:
+                if label['font']:
+                    self._xml_empty_tag('c:spPr')
+                    self._write_tx_pr(label['font'])
 
             self._xml_end_tag('c:dLbl')
 
@@ -3622,7 +3614,7 @@ def _write_custom_label_str(self, label):
         self._xml_start_tag('c:tx')
 
         # Write the c:rich element.
-        self._write_rich_label(title, font)
+        self._write_rich(title, font, is_y_axis=False, is_data_label=True)
 
         self._xml_end_tag('c:tx')
 
@@ -3645,6 +3637,10 @@ def _write_custom_label_formula(self, label):
 
         self._xml_end_tag('c:tx')
 
+        if label['font']:
+            self._xml_empty_tag('c:spPr')
+            self._write_tx_pr(label['font'])
+
     def _write_show_legend_key(self):
         # Write the <c:showLegendKey> element.
         val = '1'
@@ -3770,7 +3766,7 @@ def _write_d_table(self):
 
         if table['font']:
             # Write the table font.
-            self._write_tx_pr(None, table['font'])
+            self._write_tx_pr(table['font'])
 
         self._xml_end_tag('c:dTable')
 
diff --git a/xlsxwriter/test/comparison/test_chart_data_labels26.py b/xlsxwriter/test/comparison/test_chart_data_labels26.py
index ac49a37b5..9cfb90540 100644
--- a/xlsxwriter/test/comparison/test_chart_data_labels26.py
+++ b/xlsxwriter/test/comparison/test_chart_data_labels26.py
@@ -43,7 +43,7 @@ def test_create_file(self):
 
         chart.add_series({
             'values': '=Sheet1!$A$1:$A$5',
-            'data_labels': {'value': 1, 'custom': [{'value': 33}]}
+            'data_labels': {'value': True, 'custom': [{'value': 33}]}
         })
 
         chart.add_series({'values': '=Sheet1!$B$1:$B$5'})
diff --git a/xlsxwriter/test/comparison/test_chart_data_labels27.py b/xlsxwriter/test/comparison/test_chart_data_labels27.py
index 9ebbb262f..7fef0e11a 100644
--- a/xlsxwriter/test/comparison/test_chart_data_labels27.py
+++ b/xlsxwriter/test/comparison/test_chart_data_labels27.py
@@ -43,7 +43,7 @@ def test_create_file(self):
 
         chart.add_series({
             'values': '=Sheet1!$A$1:$A$5',
-            'data_labels': {'value': 1, 'custom': [{'value': '=Sheet1!$D$1'}]}
+            'data_labels': {'value': True, 'custom': [{'value': '=Sheet1!$D$1'}]}
         })
 
         chart.add_series({'values': '=Sheet1!$B$1:$B$5'})
diff --git a/xlsxwriter/test/comparison/test_chart_data_labels28.py b/xlsxwriter/test/comparison/test_chart_data_labels28.py
index 1fd474b17..b283e7453 100644
--- a/xlsxwriter/test/comparison/test_chart_data_labels28.py
+++ b/xlsxwriter/test/comparison/test_chart_data_labels28.py
@@ -51,7 +51,7 @@ def test_create_file(self):
 
         chart.add_series({
             'values': '=Sheet1!$A$1:$A$5',
-            'data_labels': {'value': 1, 'custom': custom}
+            'data_labels': {'value': True, 'custom': custom}
         })
 
         chart.add_series({'values': '=Sheet1!$B$1:$B$5'})
diff --git a/xlsxwriter/test/comparison/test_chart_data_labels29.py b/xlsxwriter/test/comparison/test_chart_data_labels29.py
index 39a05ce41..8ae2995a5 100644
--- a/xlsxwriter/test/comparison/test_chart_data_labels29.py
+++ b/xlsxwriter/test/comparison/test_chart_data_labels29.py
@@ -41,7 +41,7 @@ def test_create_file(self):
 
         chart.add_series({
             'values': '=Sheet1!$A$1:$A$5',
-            'data_labels': {'value': 1, 'custom': [{'delete': 1}]}
+            'data_labels': {'value': True, 'custom': [{'delete': 1}]}
         })
 
         chart.add_series({'values': '=Sheet1!$B$1:$B$5'})
diff --git a/xlsxwriter/test/comparison/test_chart_data_labels30.py b/xlsxwriter/test/comparison/test_chart_data_labels30.py
index 6c729cf7a..92e881097 100644
--- a/xlsxwriter/test/comparison/test_chart_data_labels30.py
+++ b/xlsxwriter/test/comparison/test_chart_data_labels30.py
@@ -42,7 +42,7 @@ def test_create_file(self):
         chart.add_series({
             'values': '=Sheet1!$A$1:$A$5',
             'data_labels': {
-                'value': 1,
+                'value': True,
                 'custom': [{'delete': True}, None, {'delete': True}, None, {'delete': True}]
             }
         })
diff --git a/xlsxwriter/test/comparison/test_chart_data_labels31.py b/xlsxwriter/test/comparison/test_chart_data_labels31.py
new file mode 100644
index 000000000..6450c523a
--- /dev/null
+++ b/xlsxwriter/test/comparison/test_chart_data_labels31.py
@@ -0,0 +1,56 @@
+###############################################################################
+#
+# Tests for XlsxWriter.
+#
+# Copyright (c), 2013-2019, John McNamara, jmcnamara@cpan.org
+#
+
+from ..excel_comparison_test import ExcelComparisonTest
+from ...workbook import Workbook
+
+
+class TestCompareXLSXFiles(ExcelComparisonTest):
+    """
+    Test file created by XlsxWriter against a file created by Excel.
+
+    """
+
+    def setUp(self):
+
+        self.set_filename('chart_data_labels31.xlsx')
+
+    def test_create_file(self):
+        """Test the creation of a simple XlsxWriter file."""
+
+        workbook = Workbook(self.got_filename)
+
+        worksheet = workbook.add_worksheet()
+        chart = workbook.add_chart({'type': 'column'})
+
+        chart.axis_ids = [71248896, 71373568]
+
+        data = [
+            [1, 2, 3, 4, 5],
+            [2, 4, 6, 8, 10],
+            [3, 6, 9, 12, 15],
+            [10, 20, 30, 40, 50],
+        ]
+
+        worksheet.write_column('A1', data[0])
+        worksheet.write_column('B1', data[1])
+        worksheet.write_column('C1', data[2])
+        worksheet.write_column('D1', data[3])
+
+        chart.add_series({
+            'values': '=Sheet1!$A$1:$A$5',
+            'data_labels': {'value': True, 'category': True, 'series_name': True, 'custom': [{'value': 33}]}
+        })
+
+        chart.add_series({'values': '=Sheet1!$B$1:$B$5'})
+        chart.add_series({'values': '=Sheet1!$C$1:$C$5'})
+
+        worksheet.insert_chart('E9', chart)
+
+        workbook.close()
+
+        self.assertExcelEqual()
diff --git a/xlsxwriter/test/comparison/test_chart_data_labels32.py b/xlsxwriter/test/comparison/test_chart_data_labels32.py
new file mode 100644
index 000000000..aa2c6a7a6
--- /dev/null
+++ b/xlsxwriter/test/comparison/test_chart_data_labels32.py
@@ -0,0 +1,56 @@
+###############################################################################
+#
+# Tests for XlsxWriter.
+#
+# Copyright (c), 2013-2019, John McNamara, jmcnamara@cpan.org
+#
+
+from ..excel_comparison_test import ExcelComparisonTest
+from ...workbook import Workbook
+
+
+class TestCompareXLSXFiles(ExcelComparisonTest):
+    """
+    Test file created by XlsxWriter against a file created by Excel.
+
+    """
+
+    def setUp(self):
+
+        self.set_filename('chart_data_labels32.xlsx')
+
+    def test_create_file(self):
+        """Test the creation of a simple XlsxWriter file."""
+
+        workbook = Workbook(self.got_filename)
+
+        worksheet = workbook.add_worksheet()
+        chart = workbook.add_chart({'type': 'column'})
+
+        chart.axis_ids = [71374336, 71414144]
+
+        data = [
+            [1, 2, 3, 4, 5],
+            [2, 4, 6, 8, 10],
+            [3, 6, 9, 12, 15],
+            [10, 20, 30, 40, 50],
+        ]
+
+        worksheet.write_column('A1', data[0])
+        worksheet.write_column('B1', data[1])
+        worksheet.write_column('C1', data[2])
+        worksheet.write_column('D1', data[3])
+
+        chart.add_series({
+            'values': '=Sheet1!$A$1:$A$5',
+            'data_labels': {'value': True, 'custom': [{'value': 33, 'font': {'bold': True, 'italic': True, 'color': 'red', 'baseline': -1}}]}
+        })
+
+        chart.add_series({'values': '=Sheet1!$B$1:$B$5'})
+        chart.add_series({'values': '=Sheet1!$C$1:$C$5'})
+
+        worksheet.insert_chart('E9', chart)
+
+        workbook.close()
+
+        self.assertExcelEqual()
diff --git a/xlsxwriter/test/comparison/test_chart_data_labels33.py b/xlsxwriter/test/comparison/test_chart_data_labels33.py
new file mode 100644
index 000000000..33ebb043d
--- /dev/null
+++ b/xlsxwriter/test/comparison/test_chart_data_labels33.py
@@ -0,0 +1,56 @@
+###############################################################################
+#
+# Tests for XlsxWriter.
+#
+# Copyright (c), 2013-2019, John McNamara, jmcnamara@cpan.org
+#
+
+from ..excel_comparison_test import ExcelComparisonTest
+from ...workbook import Workbook
+
+
+class TestCompareXLSXFiles(ExcelComparisonTest):
+    """
+    Test file created by XlsxWriter against a file created by Excel.
+
+    """
+
+    def setUp(self):
+
+        self.set_filename('chart_data_labels33.xlsx')
+
+    def test_create_file(self):
+        """Test the creation of a simple XlsxWriter file."""
+
+        workbook = Workbook(self.got_filename)
+
+        worksheet = workbook.add_worksheet()
+        chart = workbook.add_chart({'type': 'column'})
+
+        chart.axis_ids = [65546112, 70217728]
+
+        data = [
+            [1, 2, 3, 4, 5],
+            [2, 4, 6, 8, 10],
+            [3, 6, 9, 12, 15],
+            [10, 20, 30, 40, 50],
+        ]
+
+        worksheet.write_column('A1', data[0])
+        worksheet.write_column('B1', data[1])
+        worksheet.write_column('C1', data[2])
+        worksheet.write_column('D1', data[3])
+
+        chart.add_series({
+            'values': '=Sheet1!$A$1:$A$5',
+            'data_labels': {'value': 1, 'custom': [{'font': {'bold': 1, 'italic': 1, 'baseline': -1}}]}
+        })
+
+        chart.add_series({'values': '=Sheet1!$B$1:$B$5'})
+        chart.add_series({'values': '=Sheet1!$C$1:$C$5'})
+
+        worksheet.insert_chart('E9', chart)
+
+        workbook.close()
+
+        self.assertExcelEqual()
diff --git a/xlsxwriter/test/comparison/test_chart_data_labels34.py b/xlsxwriter/test/comparison/test_chart_data_labels34.py
new file mode 100644
index 000000000..75e11913d
--- /dev/null
+++ b/xlsxwriter/test/comparison/test_chart_data_labels34.py
@@ -0,0 +1,56 @@
+###############################################################################
+#
+# Tests for XlsxWriter.
+#
+# Copyright (c), 2013-2019, John McNamara, jmcnamara@cpan.org
+#
+
+from ..excel_comparison_test import ExcelComparisonTest
+from ...workbook import Workbook
+
+
+class TestCompareXLSXFiles(ExcelComparisonTest):
+    """
+    Test file created by XlsxWriter against a file created by Excel.
+
+    """
+
+    def setUp(self):
+
+        self.set_filename('chart_data_labels34.xlsx')
+
+    def test_create_file(self):
+        """Test the creation of a simple XlsxWriter file."""
+
+        workbook = Workbook(self.got_filename)
+
+        worksheet = workbook.add_worksheet()
+        chart = workbook.add_chart({'type': 'column'})
+
+        chart.axis_ids = [48497792, 48499712]
+
+        data = [
+            [1, 2, 3, 4, 5],
+            [2, 4, 6, 8, 10],
+            [3, 6, 9, 12, 15],
+            [10, 20, 30, 40, 50],
+        ]
+
+        worksheet.write_column('A1', data[0])
+        worksheet.write_column('B1', data[1])
+        worksheet.write_column('C1', data[2])
+        worksheet.write_column('D1', data[3])
+
+        chart.add_series({
+            'values': '=Sheet1!$A$1:$A$5',
+            'data_labels': {'value': 1, 'custom': [{'value': '=Sheet1!$D$1', 'font': {'bold': 1, 'italic': 1, 'color': 'red', 'baseline': -1}}]}
+        })
+
+        chart.add_series({'values': '=Sheet1!$B$1:$B$5'})
+        chart.add_series({'values': '=Sheet1!$C$1:$C$5'})
+
+        worksheet.insert_chart('E9', chart)
+
+        workbook.close()
+
+        self.assertExcelEqual()
diff --git a/xlsxwriter/test/comparison/xlsx_files/chart_data_labels31.xlsx b/xlsxwriter/test/comparison/xlsx_files/chart_data_labels31.xlsx
new file mode 100644
index 000000000..fe5201ff3
Binary files /dev/null and b/xlsxwriter/test/comparison/xlsx_files/chart_data_labels31.xlsx differ
diff --git a/xlsxwriter/test/comparison/xlsx_files/chart_data_labels32.xlsx b/xlsxwriter/test/comparison/xlsx_files/chart_data_labels32.xlsx
new file mode 100644
index 000000000..42aebd2d2
Binary files /dev/null and b/xlsxwriter/test/comparison/xlsx_files/chart_data_labels32.xlsx differ
diff --git a/xlsxwriter/test/comparison/xlsx_files/chart_data_labels33.xlsx b/xlsxwriter/test/comparison/xlsx_files/chart_data_labels33.xlsx
new file mode 100644
index 000000000..61dcb2dac
Binary files /dev/null and b/xlsxwriter/test/comparison/xlsx_files/chart_data_labels33.xlsx differ
diff --git a/xlsxwriter/test/comparison/xlsx_files/chart_data_labels34.xlsx b/xlsxwriter/test/comparison/xlsx_files/chart_data_labels34.xlsx
new file mode 100644
index 000000000..e75470504
Binary files /dev/null and b/xlsxwriter/test/comparison/xlsx_files/chart_data_labels34.xlsx differ