diff --git a/django/contrib/admin/options.py b/django/contrib/admin/options.py
index 942385e1c6..e9f4a43185 100644
--- a/django/contrib/admin/options.py
+++ b/django/contrib/admin/options.py
@@ -40,6 +40,8 @@ from django.utils.translation import ugettext as _
 from django.utils.translation import ungettext
 from django.utils.encoding import force_text
 
+IS_POPUP_VAR = '_popup'
+
 HORIZONTAL, VERTICAL = 1, 2
 # returns the <ul> class for a given radio_admin field
 get_ul_class = lambda x: 'radiolist%s' % (' inline' if x == HORIZONTAL else '')
@@ -660,8 +662,8 @@ class ModelAdmin(BaseModelAdmin):
         """
         # If self.actions is explicitly set to None that means that we don't
         # want *any* actions enabled on this page.
-        from django.contrib.admin.views.main import IS_POPUP_VAR
-        if self.actions is None or IS_POPUP_VAR in request.GET:
+        from django.contrib.admin.views.main import _is_changelist_popup
+        if self.actions is None or _is_changelist_popup(request):
             return SortedDict()
 
         actions = []
@@ -908,7 +910,7 @@ class ModelAdmin(BaseModelAdmin):
         msg_dict = {'name': force_text(opts.verbose_name), 'obj': force_text(obj)}
         # Here, we distinguish between different save types by checking for
         # the presence of keys in request.POST.
-        if "_popup" in request.POST:
+        if IS_POPUP_VAR in request.POST:
             return HttpResponse(
                 '<!DOCTYPE html><html><head><title></title></head><body>'
                 '<script type="text/javascript">opener.dismissAddAnotherPopup(window, "%s", "%s");</script></body></html>' % \
@@ -1158,7 +1160,7 @@ class ModelAdmin(BaseModelAdmin):
         context = {
             'title': _('Add %s') % force_text(opts.verbose_name),
             'adminform': adminForm,
-            'is_popup': "_popup" in request.REQUEST,
+            'is_popup': IS_POPUP_VAR in request.REQUEST,
             'media': media,
             'inline_admin_formsets': inline_admin_formsets,
             'errors': helpers.AdminErrorList(form, formsets),
@@ -1251,7 +1253,7 @@ class ModelAdmin(BaseModelAdmin):
             'adminform': adminForm,
             'object_id': object_id,
             'original': obj,
-            'is_popup': "_popup" in request.REQUEST,
+            'is_popup': IS_POPUP_VAR in request.REQUEST,
             'media': media,
             'inline_admin_formsets': inline_admin_formsets,
             'errors': helpers.AdminErrorList(form, formsets),
diff --git a/django/contrib/admin/static/admin/js/admin/RelatedObjectLookups.js b/django/contrib/admin/static/admin/js/admin/RelatedObjectLookups.js
index ce54fa5083..6d1748663e 100644
--- a/django/contrib/admin/static/admin/js/admin/RelatedObjectLookups.js
+++ b/django/contrib/admin/static/admin/js/admin/RelatedObjectLookups.js
@@ -32,9 +32,9 @@ function showRelatedObjectLookupPopup(triggeringLink) {
     name = id_to_windowname(name);
     var href;
     if (triggeringLink.href.search(/\?/) >= 0) {
-        href = triggeringLink.href + '&pop=1';
+        href = triggeringLink.href + '&_popup=1';
     } else {
-        href = triggeringLink.href + '?pop=1';
+        href = triggeringLink.href + '?_popup=1';
     }
     var win = window.open(href, name, 'height=500,width=800,resizable=yes,scrollbars=yes');
     win.focus();
diff --git a/django/contrib/admin/templates/admin/search_form.html b/django/contrib/admin/templates/admin/search_form.html
index f5a9e7b8b9..c9b626d18f 100644
--- a/django/contrib/admin/templates/admin/search_form.html
+++ b/django/contrib/admin/templates/admin/search_form.html
@@ -6,7 +6,7 @@
 <input type="text" size="40" name="{{ search_var }}" value="{{ cl.query }}" id="searchbar" />
 <input type="submit" value="{% trans 'Search' %}" />
 {% if show_result_count %}
-    <span class="small quiet">{% blocktrans count counter=cl.result_count %}{{ counter }} result{% plural %}{{ counter }} results{% endblocktrans %} (<a href="?{% if cl.is_popup %}pop=1{% endif %}">{% blocktrans with full_result_count=cl.full_result_count %}{{ full_result_count }} total{% endblocktrans %}</a>)</span>
+    <span class="small quiet">{% blocktrans count counter=cl.result_count %}{{ counter }} result{% plural %}{{ counter }} results{% endblocktrans %} (<a href="?{% if cl.is_popup %}_popup=1{% endif %}">{% blocktrans with full_result_count=cl.full_result_count %}{{ full_result_count }} total{% endblocktrans %}</a>)</span>
 {% endif %}
 {% for pair in cl.params.items %}
     {% ifnotequal pair.0 search_var %}<input type="hidden" name="{{ pair.0 }}" value="{{ pair.1 }}"/>{% endifnotequal %}
diff --git a/django/contrib/admin/templatetags/admin_urls.py b/django/contrib/admin/templatetags/admin_urls.py
index bb1b16883d..19da87d61f 100644
--- a/django/contrib/admin/templatetags/admin_urls.py
+++ b/django/contrib/admin/templatetags/admin_urls.py
@@ -1,5 +1,3 @@
-from django.utils.http import urlencode
-
 try:
     from urllib.parse import parse_qsl, urlparse, urlunparse
 except ImportError:
@@ -8,6 +6,7 @@ except ImportError:
 from django import template
 from django.contrib.admin.util import quote
 from django.core.urlresolvers import resolve, Resolver404
+from django.utils.http import urlencode
 
 register = template.Library()
 
@@ -47,7 +46,8 @@ def add_preserved_filters(context, url, popup=False):
         merged_qs.update(preserved_filters)
 
     if popup:
-        merged_qs['_popup'] = 1
+        from django.contrib.admin.options import IS_POPUP_VAR
+        merged_qs[IS_POPUP_VAR] = 1
 
     merged_qs.update(parsed_qs)
 
diff --git a/django/contrib/admin/views/main.py b/django/contrib/admin/views/main.py
index f676706a89..56462dece8 100644
--- a/django/contrib/admin/views/main.py
+++ b/django/contrib/admin/views/main.py
@@ -15,7 +15,7 @@ from django.utils.http import urlencode
 
 from django.contrib.admin import FieldListFilter
 from django.contrib.admin.exceptions import DisallowedModelAdminLookup
-from django.contrib.admin.options import IncorrectLookupParameters
+from django.contrib.admin.options import IncorrectLookupParameters, IS_POPUP_VAR
 from django.contrib.admin.util import (quote, get_fields_from_path,
     lookup_needs_distinct, prepare_lookup_value)
 
@@ -26,7 +26,6 @@ ORDER_TYPE_VAR = 'ot'
 PAGE_VAR = 'p'
 SEARCH_VAR = 'q'
 TO_FIELD_VAR = 't'
-IS_POPUP_VAR = 'pop'
 ERROR_FLAG = 'e'
 
 IGNORED_PARAMS = (
@@ -36,6 +35,29 @@ IGNORED_PARAMS = (
 EMPTY_CHANGELIST_VALUE = ugettext_lazy('(None)')
 
 
+def _is_changelist_popup(request):
+    """
+    Returns True if the popup GET parameter is set.
+
+    This function is introduced to facilitate deprecating the legacy
+    value for IS_POPUP_VAR and should be removed at the end of the
+    deprecation cycle.
+    """
+
+    if IS_POPUP_VAR in request.GET:
+        return True
+
+    IS_LEGACY_POPUP_VAR = 'pop'
+    if IS_LEGACY_POPUP_VAR in request.GET:
+        warnings.warn(
+        "The `%s` GET parameter has been renamed to `%s`." %
+        (IS_LEGACY_POPUP_VAR, IS_POPUP_VAR),
+        PendingDeprecationWarning, 2)
+        return True
+
+    return False
+
+
 class RenameChangeListMethods(RenameMethodsBase):
     renamed_methods = (
         ('get_query_set', 'get_queryset', PendingDeprecationWarning),
@@ -67,7 +89,7 @@ class ChangeList(six.with_metaclass(RenameChangeListMethods)):
         except ValueError:
             self.page_num = 0
         self.show_all = ALL_VAR in request.GET
-        self.is_popup = IS_POPUP_VAR in request.GET
+        self.is_popup = _is_changelist_popup(request)
         self.to_field = request.GET.get(TO_FIELD_VAR)
         self.params = dict(request.GET.items())
         if PAGE_VAR in self.params:
diff --git a/django/contrib/auth/admin.py b/django/contrib/auth/admin.py
index 409078fa02..5a1db68613 100644
--- a/django/contrib/auth/admin.py
+++ b/django/contrib/auth/admin.py
@@ -1,6 +1,7 @@
 from django.db import transaction
 from django.conf import settings
 from django.contrib import admin
+from django.contrib.admin.options import IS_POPUP_VAR
 from django.contrib.auth.forms import (UserCreationForm, UserChangeForm,
     AdminPasswordChangeForm)
 from django.contrib.auth.models import User, Group
@@ -143,7 +144,7 @@ class UserAdmin(admin.ModelAdmin):
             'adminForm': adminForm,
             'form_url': form_url,
             'form': form,
-            'is_popup': '_popup' in request.REQUEST,
+            'is_popup': IS_POPUP_VAR in request.REQUEST,
             'add': True,
             'change': False,
             'has_delete_permission': False,
@@ -170,7 +171,7 @@ class UserAdmin(admin.ModelAdmin):
         # button except in two scenarios:
         # * The user has pressed the 'Save and add another' button
         # * We are adding a user in a popup
-        if '_addanother' not in request.POST and '_popup' not in request.POST:
+        if '_addanother' not in request.POST and IS_POPUP_VAR not in request.POST:
             request.POST['_continue'] = 1
         return super(UserAdmin, self).response_add(request, obj,
                                                    post_url_continue)
diff --git a/docs/releases/1.6.txt b/docs/releases/1.6.txt
index bd6255eae6..16e0b94a9d 100644
--- a/docs/releases/1.6.txt
+++ b/docs/releases/1.6.txt
@@ -725,6 +725,12 @@ Miscellaneous
   returned ``False`` for blank passwords. This has been corrected in this
   release: blank passwords are now valid.
 
+* The admin :attr:`~django.contrib.admin.ModelAdmin.changelist_view` previously
+  accepted a ``pop`` GET parameter to signify it was to be displayed in a popup.
+  This parameter has been renamed to ``_popup`` to be consistent with the rest
+  of the admin views. You should update your custom templates if they use the
+  previous parameter name.
+
 Features deprecated in 1.6
 ==========================
 
