diff --git a/django/forms/widgets.py b/django/forms/widgets.py
index 41263b0905..b0e355eeb6 100644
--- a/django/forms/widgets.py
+++ b/django/forms/widgets.py
@@ -646,10 +646,13 @@ class RadioFieldRenderer(object):
 
     def render(self):
         """Outputs a <ul> for this set of radio fields."""
-        return format_html('<ul>\n{0}\n</ul>',
-                           format_html_join('\n', '<li>{0}</li>',
-                                            [(force_text(w),) for w in self]
-                                            ))
+        id_ = self.attrs.get('id', None)
+        start_tag = format_html('<ul id="{0}">', id_) if id_ else '<ul>'
+        output = [start_tag]
+        for widget in self:
+            output.append(format_html('<li>{0}</li>', force_text(widget)))
+        output.append('</ul>')
+        return mark_safe('\n'.join(output))
 
 class RadioSelect(Select):
     renderer = RadioFieldRenderer
diff --git a/docs/ref/forms/widgets.txt b/docs/ref/forms/widgets.txt
index 45d9e8a4dc..836389125a 100644
--- a/docs/ref/forms/widgets.txt
+++ b/docs/ref/forms/widgets.txt
@@ -633,6 +633,11 @@ Selector and checkbox widgets
     If you decide not to loop over the radio buttons -- e.g., if your template simply includes
     ``{{ myform.beatles }}`` -- they'll be output in a ``<ul>`` with ``<li>`` tags, as above.
 
+.. versionchanged:: 1.6
+
+The outer ``<ul>`` container will now receive the ``id`` attribute defined on
+the widget.
+
 ``CheckboxSelectMultiple``
 ~~~~~~~~~~~~~~~~~~~~~~~~~~
 
diff --git a/tests/forms_tests/tests/test_forms.py b/tests/forms_tests/tests/test_forms.py
index 49a93b2ad0..45e62a492c 100644
--- a/tests/forms_tests/tests/test_forms.py
+++ b/tests/forms_tests/tests/test_forms.py
@@ -407,7 +407,7 @@ class FormsTestCase(TestCase):
         # gets a distinct ID, formed by appending an underscore plus the button's
         # zero-based index.
         f = FrameworkForm(auto_id='id_%s')
-        self.assertHTMLEqual(str(f['language']), """<ul>
+        self.assertHTMLEqual(str(f['language']), """<ul id="id_language">
 <li><label for="id_language_0"><input type="radio" id="id_language_0" value="P" name="language" /> Python</label></li>
 <li><label for="id_language_1"><input type="radio" id="id_language_1" value="J" name="language" /> Java</label></li>
 </ul>""")
@@ -416,17 +416,17 @@ class FormsTestCase(TestCase):
         # either as_table() or as_ul(), the label for the RadioSelect will point to the
         # ID of the *first* radio button.
         self.assertHTMLEqual(f.as_table(), """<tr><th><label for="id_name">Name:</label></th><td><input type="text" name="name" id="id_name" /></td></tr>
-<tr><th><label for="id_language_0">Language:</label></th><td><ul>
+<tr><th><label for="id_language_0">Language:</label></th><td><ul id="id_language">
 <li><label for="id_language_0"><input type="radio" id="id_language_0" value="P" name="language" /> Python</label></li>
 <li><label for="id_language_1"><input type="radio" id="id_language_1" value="J" name="language" /> Java</label></li>
 </ul></td></tr>""")
         self.assertHTMLEqual(f.as_ul(), """<li><label for="id_name">Name:</label> <input type="text" name="name" id="id_name" /></li>
-<li><label for="id_language_0">Language:</label> <ul>
+<li><label for="id_language_0">Language:</label> <ul id="id_language">
 <li><label for="id_language_0"><input type="radio" id="id_language_0" value="P" name="language" /> Python</label></li>
 <li><label for="id_language_1"><input type="radio" id="id_language_1" value="J" name="language" /> Java</label></li>
 </ul></li>""")
         self.assertHTMLEqual(f.as_p(), """<p><label for="id_name">Name:</label> <input type="text" name="name" id="id_name" /></p>
-<p><label for="id_language_0">Language:</label> <ul>
+<p><label for="id_language_0">Language:</label> <ul id="id_language">
 <li><label for="id_language_0"><input type="radio" id="id_language_0" value="P" name="language" /> Python</label></li>
 <li><label for="id_language_1"><input type="radio" id="id_language_1" value="J" name="language" /> Java</label></li>
 </ul></p>""")
diff --git a/tests/forms_tests/tests/test_regressions.py b/tests/forms_tests/tests/test_regressions.py
index ba741bc16b..be9dc8c593 100644
--- a/tests/forms_tests/tests/test_regressions.py
+++ b/tests/forms_tests/tests/test_regressions.py
@@ -54,7 +54,7 @@ class FormsRegressionsTestCase(TestCase):
             somechoice = ChoiceField(choices=GENDERS, widget=RadioSelect(), label='\xc5\xf8\xdf')
 
         f = SomeForm()
-        self.assertHTMLEqual(f.as_p(), '<p><label for="id_somechoice_0">\xc5\xf8\xdf:</label> <ul>\n<li><label for="id_somechoice_0"><input type="radio" id="id_somechoice_0" value="\xc5" name="somechoice" /> En tied\xe4</label></li>\n<li><label for="id_somechoice_1"><input type="radio" id="id_somechoice_1" value="\xf8" name="somechoice" /> Mies</label></li>\n<li><label for="id_somechoice_2"><input type="radio" id="id_somechoice_2" value="\xdf" name="somechoice" /> Nainen</label></li>\n</ul></p>')
+        self.assertHTMLEqual(f.as_p(), '<p><label for="id_somechoice_0">\xc5\xf8\xdf:</label> <ul id="id_somechoice">\n<li><label for="id_somechoice_0"><input type="radio" id="id_somechoice_0" value="\xc5" name="somechoice" /> En tied\xe4</label></li>\n<li><label for="id_somechoice_1"><input type="radio" id="id_somechoice_1" value="\xf8" name="somechoice" /> Mies</label></li>\n<li><label for="id_somechoice_2"><input type="radio" id="id_somechoice_2" value="\xdf" name="somechoice" /> Nainen</label></li>\n</ul></p>')
 
         # Testing choice validation with UTF-8 bytestrings as input (these are the
         # Russian abbreviations "мес." and "шт.".
@@ -70,7 +70,7 @@ class FormsRegressionsTestCase(TestCase):
         # Translated error messages used to be buggy.
         with override('ru'):
             f = SomeForm({})
-            self.assertHTMLEqual(f.as_p(), '<ul class="errorlist"><li>\u041e\u0431\u044f\u0437\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0435 \u043f\u043e\u043b\u0435.</li></ul>\n<p><label for="id_somechoice_0">\xc5\xf8\xdf:</label> <ul>\n<li><label for="id_somechoice_0"><input type="radio" id="id_somechoice_0" value="\xc5" name="somechoice" /> En tied\xe4</label></li>\n<li><label for="id_somechoice_1"><input type="radio" id="id_somechoice_1" value="\xf8" name="somechoice" /> Mies</label></li>\n<li><label for="id_somechoice_2"><input type="radio" id="id_somechoice_2" value="\xdf" name="somechoice" /> Nainen</label></li>\n</ul></p>')
+            self.assertHTMLEqual(f.as_p(), '<ul class="errorlist"><li>\u041e\u0431\u044f\u0437\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0435 \u043f\u043e\u043b\u0435.</li></ul>\n<p><label for="id_somechoice_0">\xc5\xf8\xdf:</label> <ul id="id_somechoice">\n<li><label for="id_somechoice_0"><input type="radio" id="id_somechoice_0" value="\xc5" name="somechoice" /> En tied\xe4</label></li>\n<li><label for="id_somechoice_1"><input type="radio" id="id_somechoice_1" value="\xf8" name="somechoice" /> Mies</label></li>\n<li><label for="id_somechoice_2"><input type="radio" id="id_somechoice_2" value="\xdf" name="somechoice" /> Nainen</label></li>\n</ul></p>')
 
         # Deep copying translated text shouldn't raise an error)
         from django.utils.translation import gettext_lazy
diff --git a/tests/forms_tests/tests/test_widgets.py b/tests/forms_tests/tests/test_widgets.py
index 2ecdb1d065..3c782713f3 100644
--- a/tests/forms_tests/tests/test_widgets.py
+++ b/tests/forms_tests/tests/test_widgets.py
@@ -684,7 +684,7 @@ beatle J R Ringo False""")
 
         # Attributes provided at instantiation are passed to the constituent inputs
         w = RadioSelect(attrs={'id':'foo'})
-        self.assertHTMLEqual(w.render('beatle', 'J', choices=(('J', 'John'), ('P', 'Paul'), ('G', 'George'), ('R', 'Ringo'))), """<ul>
+        self.assertHTMLEqual(w.render('beatle', 'J', choices=(('J', 'John'), ('P', 'Paul'), ('G', 'George'), ('R', 'Ringo'))), """<ul id="foo">
 <li><label for="foo_0"><input checked="checked" type="radio" id="foo_0" value="J" name="beatle" /> John</label></li>
 <li><label for="foo_1"><input type="radio" id="foo_1" value="P" name="beatle" /> Paul</label></li>
 <li><label for="foo_2"><input type="radio" id="foo_2" value="G" name="beatle" /> George</label></li>
@@ -693,7 +693,7 @@ beatle J R Ringo False""")
 
         # Attributes provided at render-time are passed to the constituent inputs
         w = RadioSelect()
-        self.assertHTMLEqual(w.render('beatle', 'J', choices=(('J', 'John'), ('P', 'Paul'), ('G', 'George'), ('R', 'Ringo')), attrs={'id':'bar'}), """<ul>
+        self.assertHTMLEqual(w.render('beatle', 'J', choices=(('J', 'John'), ('P', 'Paul'), ('G', 'George'), ('R', 'Ringo')), attrs={'id':'bar'}), """<ul id="bar">
 <li><label for="bar_0"><input checked="checked" type="radio" id="bar_0" value="J" name="beatle" /> John</label></li>
 <li><label for="bar_1"><input type="radio" id="bar_1" value="P" name="beatle" /> Paul</label></li>
 <li><label for="bar_2"><input type="radio" id="bar_2" value="G" name="beatle" /> George</label></li>