Boulter's Island is an island in the River Thames at Boulter's Lock, near Maidenhead, Berkshire.
Boulter's Island is accessible by motor vehicle via Boulter's Bridge across the tail of Boulter's Lock. The island has a number of private houses, a restaurant and a small boatyard with a slipway.
Ray Mill Island lies alongside to the east, separated from Boulter's Island by the Ray Mill Stream.
Richard Dimbleby, the BBC broadcaster lived for many years in a house on Boulter's Island.
Coordinates 51°32'5.982" N -0°41'57.689" E