diff --git a/.changes/unreleased/BUG FIXES-20230210-175832.yaml b/.changes/unreleased/BUG FIXES-20230210-175832.yaml
new file mode 100644
index 0000000..b0c2dce
--- /dev/null
+++ b/.changes/unreleased/BUG FIXES-20230210-175832.yaml	
@@ -0,0 +1,5 @@
+kind: BUG FIXES
+body: 'datasource/timeouts: Use default for null and unknown ([#35](https://github.com/hashicorp/terraform-plugin-framework-timeouts/pull/35)).'
+time: 2023-02-10T17:58:32.928723089+01:00
+custom:
+  Issue: "35"
diff --git a/.changes/unreleased/BUG FIXES-20230210-175852.yaml b/.changes/unreleased/BUG FIXES-20230210-175852.yaml
new file mode 100644
index 0000000..e29acab
--- /dev/null
+++ b/.changes/unreleased/BUG FIXES-20230210-175852.yaml	
@@ -0,0 +1,5 @@
+kind: BUG FIXES
+body: 'resource/timeouts: Use default for null and unknown ([#35](https://github.com/hashicorp/terraform-plugin-framework-timeouts/pull/35)).'
+time: 2023-02-10T17:58:52.979389154+01:00
+custom:
+  Issue: "35"
diff --git a/datasource/timeouts/timeouts.go b/datasource/timeouts/timeouts.go
index 21f1caa..201d059 100644
--- a/datasource/timeouts/timeouts.go
+++ b/datasource/timeouts/timeouts.go
@@ -89,6 +89,12 @@ func (t Value) getTimeout(ctx context.Context, timeoutName string, defaultTimeou
 		return defaultTimeout, diags
 	}
 
+	if value.IsNull() || value.IsUnknown() {
+		tflog.Info(ctx, timeoutName+" timeout configuration is null or unknown, using provided default")
+
+		return defaultTimeout, diags
+	}
+
 	// No type assertion check is required as the schema guarantees that the object attributes
 	// are types.String.
 	timeout, err := time.ParseDuration(value.(types.String).ValueString())
diff --git a/datasource/timeouts/timeouts_test.go b/datasource/timeouts/timeouts_test.go
index ae683e7..4aabf1b 100644
--- a/datasource/timeouts/timeouts_test.go
+++ b/datasource/timeouts/timeouts_test.go
@@ -165,6 +165,32 @@ func TestTimeoutsValueRead(t *testing.T) {
 			},
 			expectedTimeout: 20 * time.Minute,
 		},
+		"read-null": {
+			timeoutsValue: timeouts.Value{
+				Object: types.ObjectValueMust(
+					map[string]attr.Type{
+						"read": types.StringType,
+					},
+					map[string]attr.Value{
+						"read": types.StringNull(),
+					},
+				),
+			},
+			expectedTimeout: 20 * time.Minute,
+		},
+		"read-unknown": {
+			timeoutsValue: timeouts.Value{
+				Object: types.ObjectValueMust(
+					map[string]attr.Type{
+						"read": types.StringType,
+					},
+					map[string]attr.Value{
+						"read": types.StringUnknown(),
+					},
+				),
+			},
+			expectedTimeout: 20 * time.Minute,
+		},
 		"read-not-parseable-as-time-duration": {
 			timeoutsValue: timeouts.Value{
 				Object: types.ObjectValueMust(
diff --git a/resource/timeouts/timeouts.go b/resource/timeouts/timeouts.go
index d2b7cfa..b35c151 100644
--- a/resource/timeouts/timeouts.go
+++ b/resource/timeouts/timeouts.go
@@ -107,6 +107,12 @@ func (t Value) getTimeout(ctx context.Context, timeoutName string, defaultTimeou
 		return defaultTimeout, diags
 	}
 
+	if value.IsNull() || value.IsUnknown() {
+		tflog.Info(ctx, timeoutName+" timeout configuration is null or unknown, using provided default")
+
+		return defaultTimeout, diags
+	}
+
 	// No type assertion check is required as the schema guarantees that the object attributes
 	// are types.String.
 	timeout, err := time.ParseDuration(value.(types.String).ValueString())
diff --git a/resource/timeouts/timeouts_test.go b/resource/timeouts/timeouts_test.go
index f2b5d51..e41d74e 100644
--- a/resource/timeouts/timeouts_test.go
+++ b/resource/timeouts/timeouts_test.go
@@ -180,6 +180,32 @@ func TestTimeoutsValueCreate(t *testing.T) {
 			},
 			expectedTimeout: 20 * time.Minute,
 		},
+		"create-null": {
+			timeoutsValue: timeouts.Value{
+				Object: types.ObjectValueMust(
+					map[string]attr.Type{
+						"create": types.StringType,
+					},
+					map[string]attr.Value{
+						"create": types.StringNull(),
+					},
+				),
+			},
+			expectedTimeout: 20 * time.Minute,
+		},
+		"create-unknown": {
+			timeoutsValue: timeouts.Value{
+				Object: types.ObjectValueMust(
+					map[string]attr.Type{
+						"create": types.StringType,
+					},
+					map[string]attr.Value{
+						"create": types.StringUnknown(),
+					},
+				),
+			},
+			expectedTimeout: 20 * time.Minute,
+		},
 		"create-not-parseable-as-time-duration": {
 			timeoutsValue: timeouts.Value{
 				Object: types.ObjectValueMust(
@@ -248,6 +274,32 @@ func TestTimeoutsValueRead(t *testing.T) {
 			},
 			expectedTimeout: 20 * time.Minute,
 		},
+		"read-null": {
+			timeoutsValue: timeouts.Value{
+				Object: types.ObjectValueMust(
+					map[string]attr.Type{
+						"read": types.StringType,
+					},
+					map[string]attr.Value{
+						"read": types.StringNull(),
+					},
+				),
+			},
+			expectedTimeout: 20 * time.Minute,
+		},
+		"read-unknown": {
+			timeoutsValue: timeouts.Value{
+				Object: types.ObjectValueMust(
+					map[string]attr.Type{
+						"read": types.StringType,
+					},
+					map[string]attr.Value{
+						"read": types.StringUnknown(),
+					},
+				),
+			},
+			expectedTimeout: 20 * time.Minute,
+		},
 		"read-not-parseable-as-time-duration": {
 			timeoutsValue: timeouts.Value{
 				Object: types.ObjectValueMust(
@@ -316,6 +368,32 @@ func TestTimeoutsValueUpdate(t *testing.T) {
 			},
 			expectedTimeout: 20 * time.Minute,
 		},
+		"update-null": {
+			timeoutsValue: timeouts.Value{
+				Object: types.ObjectValueMust(
+					map[string]attr.Type{
+						"update": types.StringType,
+					},
+					map[string]attr.Value{
+						"update": types.StringNull(),
+					},
+				),
+			},
+			expectedTimeout: 20 * time.Minute,
+		},
+		"update-unknown": {
+			timeoutsValue: timeouts.Value{
+				Object: types.ObjectValueMust(
+					map[string]attr.Type{
+						"update": types.StringType,
+					},
+					map[string]attr.Value{
+						"update": types.StringUnknown(),
+					},
+				),
+			},
+			expectedTimeout: 20 * time.Minute,
+		},
 		"update-not-parseable-as-time-duration": {
 			timeoutsValue: timeouts.Value{
 				Object: types.ObjectValueMust(
@@ -384,6 +462,32 @@ func TestTimeoutsValueDelete(t *testing.T) {
 			},
 			expectedTimeout: 20 * time.Minute,
 		},
+		"delete-null": {
+			timeoutsValue: timeouts.Value{
+				Object: types.ObjectValueMust(
+					map[string]attr.Type{
+						"delete": types.StringType,
+					},
+					map[string]attr.Value{
+						"delete": types.StringNull(),
+					},
+				),
+			},
+			expectedTimeout: 20 * time.Minute,
+		},
+		"delete-unknown": {
+			timeoutsValue: timeouts.Value{
+				Object: types.ObjectValueMust(
+					map[string]attr.Type{
+						"delete": types.StringType,
+					},
+					map[string]attr.Value{
+						"delete": types.StringUnknown(),
+					},
+				),
+			},
+			expectedTimeout: 20 * time.Minute,
+		},
 		"delete-not-parseable-as-time-duration": {
 			timeoutsValue: timeouts.Value{
 				Object: types.ObjectValueMust(