Milton Locks is a 1-hectare (2.5-acre) nature reserve in Milton in Hampshire. It is managed by the Hampshire and Isle of Wight Wildlife Trust.

This site on Portsea Island has grassland, a wood and a beach. There are saltmarsh plants such as sea purslane, sea aster and common saltmarsh-grass. The wood provides shelter for starlings and house sparrows.

50°47′35″N 1°02′31″W / 50.793°N 1.042°W / 50.793; -1.042