diff --git a/django/contrib/admin/views/main.py b/django/contrib/admin/views/main.py
index 50b015352d..0a5ab372ec 100644
--- a/django/contrib/admin/views/main.py
+++ b/django/contrib/admin/views/main.py
@@ -179,6 +179,10 @@ class ChangeList(object):
                 del lookup_params[key]
                 lookup_params[smart_str(key)] = value
 
+            # if key ends with __in, split parameter into separate values
+            if key.endswith('__in'):
+                lookup_params[key] = value.split(',')
+
         # Apply lookup parameters from the query string.
         qs = qs.filter(**lookup_params)
 
diff --git a/django/contrib/admin/widgets.py b/django/contrib/admin/widgets.py
index aaf1caafe7..d3deada0ed 100644
--- a/django/contrib/admin/widgets.py
+++ b/django/contrib/admin/widgets.py
@@ -102,7 +102,7 @@ class ForeignKeyRawIdWidget(forms.TextInput):
     def render(self, name, value, attrs=None):
         related_url = '../../../%s/%s/' % (self.rel.to._meta.app_label, self.rel.to._meta.object_name.lower())
         if self.rel.limit_choices_to:
-            url = '?' + '&'.join(['%s=%s' % (k, v) for k, v in self.rel.limit_choices_to.items()])
+            url = '?' + '&'.join(['%s=%s' % (k, ','.join(v)) for k, v in self.rel.limit_choices_to.items()])
         else:
             url = ''
         if not attrs.has_key('class'):