Sunbury Lock Ait is an ait (island) in the River Thames in England adjacent to Sunbury Lock, near Walton-on-Thames, Surrey. It is unpopulated, but accessible by a footbridge over the lock cut from the southern bank as well as by a connection to the lock. There is a footbridge across the weir to Wheatley's Ait just upstream, but this is closed to the public. The island is inaccessible from Sunbury-on-Thames except by boat.
The lock island was not created as a result of building the lock cut, but was already in existence. It was known as "Sunbury Church Ait" when the City of London Corporation purchased it from about six proprietors to build the lock. The footbridge and lockhouse are located where the lock originally sat, some distance upstream of the present locks.[1]
| Next island upstream | River Thames | Next island downstream |
| Wheatley's Ait | Sunbury Lock Ait | Rivermead Island |