diff -r 3f72b3a96508 Lib/concurrent/futures/process.py
--- a/Lib/concurrent/futures/process.py	Sat Oct 20 13:16:49 2012 +0100
+++ b/Lib/concurrent/futures/process.py	Sat Oct 20 13:19:18 2012 +0100
@@ -240,6 +240,7 @@
                         "terminated abruptly while the future was "
                         "running or pending."
                     ))
+                del work_item
             pending_work_items.clear()
             # Terminate remaining workers forcibly: the queues or their
             # locks may be in a dirty state and block forever.
@@ -264,6 +265,7 @@
                     work_item.future.set_exception(result_item.exception)
                 else:
                     work_item.future.set_result(result_item.result)
+                del work_item
         # Check whether we should start shutting down.
         executor = executor_reference()
         # No more work items can be added if:
diff -r 3f72b3a96508 Lib/concurrent/futures/thread.py
--- a/Lib/concurrent/futures/thread.py	Sat Oct 20 13:16:49 2012 +0100
+++ b/Lib/concurrent/futures/thread.py	Sat Oct 20 13:19:18 2012 +0100
@@ -63,6 +63,7 @@
             work_item = work_queue.get(block=True)
             if work_item is not None:
                 work_item.run()
+                del work_item
                 continue
             executor = executor_reference()
             # Exit if:
diff -r 3f72b3a96508 Lib/multiprocessing/queues.py
--- a/Lib/multiprocessing/queues.py	Sat Oct 20 13:16:49 2012 +0100
+++ b/Lib/multiprocessing/queues.py	Sat Oct 20 13:19:18 2012 +0100
@@ -243,10 +243,12 @@
 
                         if wacquire is None:
                             send(obj)
+                            del obj
                         else:
                             wacquire()
                             try:
                                 send(obj)
+                                del obj
                             finally:
                                 wrelease()
                 except IndexError:
diff -r 3f72b3a96508 Lib/test/test_concurrent_futures.py
--- a/Lib/test/test_concurrent_futures.py	Sat Oct 20 13:16:49 2012 +0100
+++ b/Lib/test/test_concurrent_futures.py	Sat Oct 20 13:19:18 2012 +0100
@@ -15,6 +15,7 @@
 import threading
 import time
 import unittest
+import weakref
 
 from concurrent import futures
 from concurrent.futures._base import (
@@ -52,6 +53,11 @@
     sys.stdout.flush()
 
 
+class MyObject(object):
+    def my_method(self):
+        pass
+
+
 class ExecutorMixin:
     worker_count = 5
 
@@ -396,6 +402,21 @@
         self.executor.map(str, [2] * (self.worker_count + 1))
         self.executor.shutdown()
 
+    def test_no_stale_references(self):
+        # Issue #16284: check that the executors don't unnecessarily hang onto
+        # references.
+        my_object = MyObject()
+        my_object_collected = threading.Event()
+        my_object_callback = weakref.ref(
+            my_object, lambda obj: my_object_collected.set())
+        # Deliberately discarding the future.
+        self.executor.submit(my_object.my_method)
+        del my_object
+
+        collected = my_object_collected.wait(timeout=5.0)
+        self.assertTrue(collected,
+                        "Stale reference not collected within timeout.")
+
 
 class ThreadPoolExecutorTest(ThreadPoolMixin, ExecutorTest):
     def test_map_submits_without_iteration(self):