King's Lock is a lock on the River Thames in England. It is in open country about 1 km north of Godstow, to the north of Oxford, Oxfordshire, at grid reference SP478102, on the southern bank of the river. The lock was one of the last pound locks built on the Thames, built by the Thames Conservancy in 1928 to replace the former flash lock. It has the smallest fall of any lock on the river, 0.77 m.