<p>A locking device (1) is provided for a door latch in which a latch bar of the door latch mechanism is turnable to retract a latch bolt of the latch mechanism. A locking means is adapted to be actuated in response to turning of a door handle (3) for the latch mechanism in an anti-clockwise direction so as to lock the latch bolt in its extended latching position. It is releasable by turning the handle in the clockwise direction.</p>
