diff --git a/django/newforms/fields.py b/django/newforms/fields.py
index a2d8afbdeb..522a4c9bf7 100644
--- a/django/newforms/fields.py
+++ b/django/newforms/fields.py
@@ -416,6 +416,9 @@ class URLField(RegexField):
         self.user_agent = validator_user_agent
 
     def clean(self, value):
+        # If no URL scheme given, assume http://
+        if value and '://' not in value:
+            value = u'http://%s' % value
         value = super(URLField, self).clean(value)
         if value == u'':
             return value
diff --git a/tests/regressiontests/forms/tests.py b/tests/regressiontests/forms/tests.py
index 2cbe5a4400..fef8361a14 100644
--- a/tests/regressiontests/forms/tests.py
+++ b/tests/regressiontests/forms/tests.py
@@ -1623,10 +1623,6 @@ u'http://200.8.9.10:8000/test'
 Traceback (most recent call last):
 ...
 ValidationError: [u'Enter a valid URL.']
->>> f.clean('example.com')
-Traceback (most recent call last):
-...
-ValidationError: [u'Enter a valid URL.']
 >>> f.clean('http://')
 Traceback (most recent call last):
 ...
@@ -1657,10 +1653,6 @@ u'http://www.example.com'
 Traceback (most recent call last):
 ...
 ValidationError: [u'Enter a valid URL.']
->>> f.clean('example.com')
-Traceback (most recent call last):
-...
-ValidationError: [u'Enter a valid URL.']
 >>> f.clean('http://')
 Traceback (most recent call last):
 ...
@@ -1714,6 +1706,15 @@ Traceback (most recent call last):
 ...
 ValidationError: [u'Ensure this value has at most 20 characters (it has 37).']
 
+URLField should prepend 'http://' if no scheme was given
+>>> f = URLField(required=False)
+>>> f.clean('example.com')
+u'http://example.com'
+>>> f.clean('')
+u''
+>>> f.clean('https://example.com')
+u'https://example.com'
+
 # BooleanField ################################################################
 
 >>> f = BooleanField()