diff --git a/Lib/test/lock_tests.py b/Lib/test/lock_tests.py
--- a/Lib/test/lock_tests.py
+++ b/Lib/test/lock_tests.py
@@ -77,17 +77,23 @@ class BaseLockTests(BaseTestCase):
     """
 
     def test_constructor(self):
         lock = self.locktype()
         del lock
 
     def test_repr(self):
         lock = self.locktype()
-        repr(lock)
+        self.assertTrue(repr(lock).startswith("<unlocked "))
+        del lock
+
+    def test_locked_repr(self):
+        lock = self.locktype()
+        lock.acquire()
+        self.assertTrue(repr(lock).startswith("<locked "))
         del lock
 
     def test_acquire_destroy(self):
         lock = self.locktype()
         lock.acquire()
         del lock
 
     def test_acquire_release(self):
diff --git a/Modules/_threadmodule.c b/Modules/_threadmodule.c
--- a/Modules/_threadmodule.c
+++ b/Modules/_threadmodule.c
@@ -187,16 +187,23 @@ lock_locked_lock(lockobject *self)
 }
 
 PyDoc_STRVAR(locked_doc,
 "locked() -> bool\n\
 (locked_lock() is an obsolete synonym)\n\
 \n\
 Return whether the lock is in the locked state.");
 
+static PyObject *
+lock_repr(lockobject *self)
+{
+    return PyUnicode_FromFormat("<%s %s object>",
+        self->locked ? "locked" : "unlocked", Py_TYPE(self)->tp_name);
+}
+
 static PyMethodDef lock_methods[] = {
     {"acquire_lock", (PyCFunction)lock_PyThread_acquire_lock,
      METH_VARARGS | METH_KEYWORDS, acquire_doc},
     {"acquire",      (PyCFunction)lock_PyThread_acquire_lock,
      METH_VARARGS | METH_KEYWORDS, acquire_doc},
     {"release_lock", (PyCFunction)lock_PyThread_release_lock,
      METH_NOARGS, release_doc},
     {"release",      (PyCFunction)lock_PyThread_release_lock,
@@ -218,17 +225,17 @@ static PyTypeObject Locktype = {
     sizeof(lockobject),                 /*tp_size*/
     0,                                  /*tp_itemsize*/
     /* methods */
     (destructor)lock_dealloc,           /*tp_dealloc*/
     0,                                  /*tp_print*/
     0,                                  /*tp_getattr*/
     0,                                  /*tp_setattr*/
     0,                                  /*tp_reserved*/
-    0,                                  /*tp_repr*/
+    (reprfunc)lock_repr,                /*tp_repr*/
     0,                                  /*tp_as_number*/
     0,                                  /*tp_as_sequence*/
     0,                                  /*tp_as_mapping*/
     0,                                  /*tp_hash*/
     0,                                  /*tp_call*/
     0,                                  /*tp_str*/
     0,                                  /*tp_getattro*/
     0,                                  /*tp_setattro*/