Ray Mill Island is an island in the River Thames in England at Boulter's Lock near Maidenhead, Berkshire.
The island is now a park administered by the Royal Borough of Windsor and Maidenhead. It is named after the Ray family who once had a flour mill here. The mill was constructed in 1726 on the site of a previous mill, and continued to produce flour until the 1920s.
Boulter's weir runs from the top end of the island across to the Taplow bank. A kayak flume has been built adjacent to the weir on the island.
For over 20 years until it was stolen in October 2011, the island housed The Companion, a memorial statue for four local schoolboys who died in a skiing accident. A new version of the statue was unveiled in the original location in July 2012.
Coordinates: 51°32′05″N 0°41′55″W / 51.5348°N 0.6986°W