diff --git a/fusionbox/forms/fields.py b/fusionbox/forms/fields.py
index 19b1ee9..f18ef20 100644
--- a/fusionbox/forms/fields.py
+++ b/fusionbox/forms/fields.py
@@ -9,6 +9,8 @@
 import datetime
 from functools import partial
 
+import phonenumbers
+
 from django import forms
 from django.contrib.auth.forms import ReadOnlyPasswordHashWidget
 from django.utils.safestring import mark_safe
@@ -143,3 +145,31 @@ def render(self, name, value, attrs):
         )
 
         return mark_safe(hidden)
+
+
+class PhoneNumberField(forms.CharField):
+    """
+    A USA or international phone number field. Normalizes its value to a common
+    US format '(303) 555-5555' for US phone numbers, and an international
+    format for others - '+86 10 6944 5464'. Also supports extensions --
+    '3035555555ex12' -> '(303) 555-5555 ext. 12.'
+    """
+
+    default_error_messages = {
+        'invalid': 'Enter a valid phone number.',
+    }
+
+    def clean(self, value):
+        if not value:
+            return value
+        try:
+            number = phonenumbers.parse(value, 'US')
+        except phonenumbers.NumberParseException:
+            raise forms.ValidationError(self.error_messages['invalid'])
+        if not phonenumbers.is_valid_number(number):
+            raise forms.ValidationError(self.error_messages['invalid'])
+
+        if number.country_code == 1:
+            return phonenumbers.format_number(number, phonenumbers.PhoneNumberFormat.NATIONAL)
+        else:
+            return phonenumbers.format_number(number, phonenumbers.PhoneNumberFormat.INTERNATIONAL)
diff --git a/setup.py b/setup.py
index 8ca59bf..5da888f 100644
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,4 @@
 #!/usr/bin/env python
-import os
-import re
 from setuptools import setup, find_packages
 
 __doc__="""
@@ -31,7 +29,7 @@
         'Environment :: Web Environment',
         'Framework :: Django',
     ],
-    install_requires = ['BeautifulSoup', 'PyYAML', 'markdown'],
-    requires = ['BeautifulSoup', 'PyYAML', 'markdown'],
+    install_requires = ['BeautifulSoup', 'PyYAML', 'markdown', 'phonenumbers'],
+    requires = ['BeautifulSoup', 'PyYAML', 'markdown', 'phonenumbers'],
 )