diff --git a/django/contrib/admin/options.py b/django/contrib/admin/options.py
index 930db7767e..696dd30387 100644
--- a/django/contrib/admin/options.py
+++ b/django/contrib/admin/options.py
@@ -94,6 +94,11 @@ class BaseModelAdmin(object):
             kwargs['widget'] = widgets.AdminIntegerFieldWidget
             return db_field.formfield(**kwargs)
 
+        # For CommaSeparatedIntegerFields, add a custom CSS class.
+        if isinstance(db_field, models.CommaSeparatedIntegerField):
+            kwargs['widget'] = widgets.AdminCommaSeparatedIntegerFieldWidget
+            return db_field.formfield(**kwargs)
+
         # For TextInputs, add a custom CSS class.
         if isinstance(db_field, models.CharField):
             kwargs['widget'] = widgets.AdminTextInputWidget
diff --git a/django/contrib/admin/widgets.py b/django/contrib/admin/widgets.py
index d5ece3f933..aaf1caafe7 100644
--- a/django/contrib/admin/widgets.py
+++ b/django/contrib/admin/widgets.py
@@ -236,3 +236,10 @@ class AdminIntegerFieldWidget(forms.TextInput):
         if attrs is not None:
             final_attrs.update(attrs)
         super(AdminIntegerFieldWidget, self).__init__(attrs=final_attrs)
+
+class AdminCommaSeparatedIntegerFieldWidget(forms.TextInput):
+    def __init__(self, attrs=None):
+        final_attrs = {'class': 'vCommaSeparatedIntegerField'}
+        if attrs is not None:
+            final_attrs.update(attrs)
+        super(AdminCommaSeparatedIntegerFieldWidget, self).__init__(attrs=final_attrs)
diff --git a/django/db/models/fields/__init__.py b/django/db/models/fields/__init__.py
index d3fb27b948..26f83158b8 100644
--- a/django/db/models/fields/__init__.py
+++ b/django/db/models/fields/__init__.py
@@ -394,7 +394,17 @@ class CharField(Field):
 
 # TODO: Maybe move this into contrib, because it's specialized.
 class CommaSeparatedIntegerField(CharField):
-    pass
+    def formfield(self, **kwargs):
+        defaults = {
+            'form_class': forms.RegexField,
+            'regex': '^[\d,]+$',
+            'max_length': self.max_length,
+            'error_messages': {
+                'invalid': _(u'Enter only digits separated by commas.'),
+            }
+        }
+        defaults.update(kwargs)
+        return super(CommaSeparatedIntegerField, self).formfield(**defaults)
 
 ansi_date_re = re.compile(r'^\d{4}-\d{1,2}-\d{1,2}$')
 
diff --git a/tests/modeltests/model_forms/models.py b/tests/modeltests/model_forms/models.py
index a2c522a1d9..b8d3f932f8 100644
--- a/tests/modeltests/model_forms/models.py
+++ b/tests/modeltests/model_forms/models.py
@@ -98,6 +98,12 @@ class ImageFile(models.Model):
     def __unicode__(self):
         return self.description
 
+class CommaSeparatedInteger(models.Model):
+    field = models.CommaSeparatedIntegerField(max_length=20)
+
+    def __unicode__(self):
+        return self.field
+
 __test__ = {'API_TESTS': """
 >>> from django import forms
 >>> from django.forms.models import ModelForm, model_to_dict
@@ -1050,4 +1056,30 @@ True
 <link href="/some/form/css" type="text/css" media="all" rel="stylesheet" />
 <script type="text/javascript" src="/some/form/javascript"></script>
 
+>>> class CommaSeparatedIntegerForm(ModelForm):
+...    class Meta:
+...        model = CommaSeparatedInteger
+
+>>> f = CommaSeparatedIntegerForm().fields['field']
+>>> f.clean('1,2,3')
+u'1,2,3'
+>>> f.clean('1a,2')
+Traceback (most recent call last):
+...
+ValidationError: [u'Enter only digits separated by commas.']
+>>> f.clean(',,,,') 
+u',,,,'
+>>> f.clean('1.2')
+Traceback (most recent call last):
+...
+ValidationError: [u'Enter only digits separated by commas.']
+>>> f.clean('1,a,2')
+Traceback (most recent call last):
+...
+ValidationError: [u'Enter only digits separated by commas.']
+>>> f.clean('1,,2')
+u'1,,2'
+>>> f.clean('1')
+u'1'
+
 """}