Swan Island is a private mooring island in the Thames at Twickenham, in the London Borough of Richmond upon Thames, London, England. It is on the Tideway about north of and thus below Teddington Lock.
The island has a commercial boatyard in addition to residential mooring for boats. It is connected to the Twickenham bank by a small bridge, which is suitable for vehicles as well as foot traffic.
Originally an osier bed, it measured per Ordnance Survey maps of 1897 and 1898.
A larger island stood north-west which has become the playground, bowling green, café and park Radnor Gardens, Strawberry Hill/Vale.
See also
Islands in the River Thames
Islands in the River Thames listed in order upstream from the sea.