diff -r 1cdedc9a9e9f Doc/library/datetime.rst
--- a/Doc/library/datetime.rst	Tue Jun 09 14:24:30 2015 -0400
+++ b/Doc/library/datetime.rst	Tue Jun 09 23:05:00 2015 +0200
@@ -557,7 +557,7 @@
 
 .. method:: date.isocalendar()
 
-   Return a 3-tuple, (ISO year, ISO week number, ISO weekday).
+   Return a 3-namedtuple, (ISO year, ISO week number, ISO weekday).
 
    The ISO calendar is a widely used variant of the Gregorian calendar. See
    http://www.staff.science.uu.nl/~gent0113/calendar/isocalendar.htm for a good
@@ -573,6 +573,9 @@
    ``date(2003, 12, 29).isocalendar() == (2004, 1, 1)`` and ``date(2004, 1,
    4).isocalendar() == (2004, 1, 7)``.
 
+   .. versionchanged:: 3.5
+      Result changed from a tuple to a namedtuple.
+
 
 .. method:: date.isoformat()
 
@@ -1129,8 +1132,8 @@
 
 .. method:: datetime.isocalendar()
 
-   Return a 3-tuple, (ISO year, ISO week number, ISO weekday).  The same as
-   ``self.date().isocalendar()``.
+   Return a 3-namedtuple, (ISO year, ISO week number, ISO weekday).  The same
+   as ``self.date().isocalendar()``.
 
 
 .. method:: datetime.isoformat(sep='T')
diff -r 1cdedc9a9e9f Lib/datetime.py
--- a/Lib/datetime.py	Tue Jun 09 14:24:30 2015 -0400
+++ b/Lib/datetime.py	Tue Jun 09 23:05:00 2015 +0200
@@ -4,6 +4,7 @@
 time zone and DST data sources.
 """
 
+from collections import namedtuple as _namedtuple
 import time as _time
 import math as _math
 
@@ -638,6 +639,8 @@
                           microseconds=999999)
 timedelta.resolution = timedelta(microseconds=1)
 
+ISOCalendarResult = _namedtuple('ISOCalendarResult', 'year week weekday')
+
 class date:
     """Concrete date type.
 
@@ -910,7 +913,7 @@
             if today >= _isoweek1monday(year+1):
                 year += 1
                 week = 0
-        return year, week+1, day+1
+        return ISOCalendarResult(year, week+1, day+1)
 
     # Pickle support.
 
diff -r 1cdedc9a9e9f Lib/test/datetimetester.py
--- a/Lib/test/datetimetester.py	Tue Jun 09 14:24:30 2015 -0400
+++ b/Lib/test/datetimetester.py	Tue Jun 09 23:05:00 2015 +0200
@@ -1102,6 +1102,13 @@
             d = self.theclass(2010, 1, 4+i)
             self.assertEqual(d.isocalendar(), (2010, 1, i+1))
 
+    def test_isocalendar_named(self):
+        d = self.theclass(2008, 12, 3)
+        t = d.isocalendar()
+        self.assertEqual(t.year, 2008)
+        self.assertEqual(t.week, 49)
+        self.assertEqual(t.weekday, 3)
+
     def test_iso_long_years(self):
         # Calculate long ISO years and compare to table from
         # http://www.phys.uu.nl/~vgent/calendar/isocalendar.htm
diff -r 1cdedc9a9e9f Misc/NEWS
--- a/Misc/NEWS	Tue Jun 09 14:24:30 2015 -0400
+++ b/Misc/NEWS	Tue Jun 09 23:05:00 2015 +0200
@@ -13,6 +13,8 @@
 Library
 -------
 
+- Issue #24416: date.isocalendar() now returns a namedtuple.
+
 Documentation
 -------------
 
diff -r 1cdedc9a9e9f Modules/_datetimemodule.c
--- a/Modules/_datetimemodule.c	Tue Jun 09 14:24:30 2015 -0400
+++ b/Modules/_datetimemodule.c	Tue Jun 09 23:05:00 2015 +0200
@@ -109,6 +109,7 @@
 #define MONTH_IS_SANE(M) ((unsigned int)(M) - 1 < 12)
 
 /* Forward declarations. */
+static PyTypeObject *ISOCalendarResult;
 static PyTypeObject PyDateTime_DateType;
 static PyTypeObject PyDateTime_DateTimeType;
 static PyTypeObject PyDateTime_DeltaType;
@@ -2727,7 +2728,8 @@
         ++year;
         week = 0;
     }
-    return Py_BuildValue("iii", year, week + 1, day + 1);
+    return PyObject_CallFunction((PyObject *)ISOCalendarResult, "iii",
+                                          year, week + 1, day + 1);
 }
 
 /* Miscellaneous methods. */
@@ -5160,6 +5162,7 @@
     NULL
 };
 
+
 PyMODINIT_FUNC
 PyInit__datetime(void)
 {
@@ -5167,6 +5170,7 @@
     PyObject *d;        /* its dict */
     PyObject *x;
     PyObject *delta;
+    PyObject *collections = NULL;
 
     m = PyModule_Create(&datetimemodule);
     if (m == NULL)
@@ -5297,6 +5301,17 @@
     PyModule_AddIntMacro(m, MINYEAR);
     PyModule_AddIntMacro(m, MAXYEAR);
 
+    /* ISOCalendarResult */
+    collections = PyImport_ImportModule("collections");
+    ISOCalendarResult = (PyTypeObject *)PyObject_CallMethod(collections,
+                                 "namedtuple", "(ss)", "ISOCalendarResult",
+                                 "year week weekday");
+
+    Py_CLEAR(collections);
+
+    Py_INCREF(ISOCalendarResult);
+    PyModule_AddObject(m, "ISOCalendarResult", (PyObject *)ISOCalendarResult);
+
     Py_INCREF(&PyDateTime_DateType);
     PyModule_AddObject(m, "date", (PyObject *) &PyDateTime_DateType);