diff --git a/django/contrib/localflavor/at/forms.py b/django/contrib/localflavor/at/forms.py
index 37fe361..61e07be 100644
--- a/django/contrib/localflavor/at/forms.py
+++ b/django/contrib/localflavor/at/forms.py
@@ -6,6 +6,9 @@ import re
 
 from django.utils.translation import ugettext_lazy as _
 from django.forms.fields import Field, RegexField, Select
+from django.forms import ValidationError
+
+re_ssn = re.compile(r'^\d{4} \d{6}')
 
 class ATZipCodeField(RegexField):
     """
@@ -25,5 +28,38 @@ class ATStateSelect(Select):
     A Select widget that uses a list of AT states as its choices.
     """
     def __init__(self, attrs=None):
-        from at_states import STATE_CHOICES
+        from django.contrib.localflavor.at.at_states import STATE_CHOICES
         super(ATStateSelect, self).__init__(attrs, choices=STATE_CHOICES)
+
+class ATSocialSecurityNumberField(Field):
+    """
+    Austrian Social Security numbers are composed of a 4 digits and 6 digits
+    field. The latter represents in most cases the person's birthdate while
+    the first 4 digits represent a 3-digits counter and a one-digit checksum.
+    
+    The 6-digits field can also differ from the person's birthdate if the
+    3-digits counter suffered an overflow.
+    
+    This code is based on information available on
+    http://de.wikipedia.org/wiki/Sozialversicherungsnummer#.C3.96sterreich
+    """
+    
+    default_error_messages = {
+        'invalid': _(u'Enter a valid Austrian Social Security Number in XXXX XXXXXX format.'),
+    }
+    
+    def clean(self, value):
+        if not re_ssn.search(value):
+            raise ValidationError(self.error_messages['invalid'])
+        sqnr, date = value.split(" ")
+        sqnr, check = (sqnr[:3], (sqnr[3]))
+        if int(sqnr) < 100:
+           raise ValidationError(self.error_messages['invalid'])
+        res = int(sqnr[0])*3 + int(sqnr[1])*7 + int(sqnr[2])*9 \
+           + int(date[0])*5 + int(date[1])*8 + int(date[2])*4 \
+           + int(date[3])*2 + int(date[4])*1 + int(date[5])*6
+        res = res % 11
+        if res != int(check):
+           raise ValidationError(self.error_messages['invalid'])
+        return u'%s%s %s'%(sqnr, check, date,)
+
diff --git a/docs/localflavor.txt b/docs/localflavor.txt
index 25ac4fb..71e353c 100644
--- a/docs/localflavor.txt
+++ b/docs/localflavor.txt
@@ -161,13 +161,18 @@ Austria (``django.contrib.localflavor.at``)
 ATZipCodeField
 ---------------
 
-A form field that validates its input is an Austrian postcode.
+A form field that validates its input as an Austrian zip code.
 
 ATStateSelect
 -------------
 
 A ``Select`` widget that uses a list of Austrian states as its choices. 
 
+ATSocialSecurityNumberField
+---------------------------
+
+A form field that validates its input as an Austrian social security number.
+
 Brazil (``django.contrib.localflavor.br``)
 ==========================================
 
diff --git a/tests/regressiontests/forms/localflavor/at.py b/tests/regressiontests/forms/localflavor/at.py
index e722901..54ca468 100644
--- a/tests/regressiontests/forms/localflavor/at.py
+++ b/tests/regressiontests/forms/localflavor/at.py
@@ -63,4 +63,18 @@ u''
 >>> f.render('bundesland', 'WI')
 u'<select name="bundesland">\n<option value="BL">Burgenland</option>\n<option value="KA">Carinthia</option>\n<option value="NO">Lower Austria</option>\n<option value="OO">Upper Austria</option>\n<option value="SA">Salzburg</option>\n<option value="ST">Styria</option>\n<option value="TI">Tyrol</option>\n<option value="VO">Vorarlberg</option>\n<option value="WI" selected="selected">Vienna</option>\n</select>'
 
+# ATSocialSecurityNumberField ################################################
+
+>>> from django.contrib.localflavor.at.forms import ATSocialSecurityNumberField
+>>> f = ATSocialSecurityNumberField()
+>>> f.clean('1237 010180')
+u'1237 010180'
+>>> f.clean('1237 010181')
+Traceback (most recent call last):
+...
+ValidationError: [u'Enter a valid Austrian Social Security Number in XXXX XXXXXX format.']
+>>> f.clean('12370 010180')
+Traceback (most recent call last):
+...
+ValidationError: [u'Enter a valid Austrian Social Security Number in XXXX XXXXXX format.']
 """