Bavin's Gulls or Sloe Grove Islands are a group of islands in the River Thames in England on the reach known as Cliveden Deep above Boulter's Lock, near Maidenhead, Berkshire. The group consists of two large and two small thin wooded strips. They are part of the Cliveden Estate and are owned by the National Trust. Overnight mooring is permitted on three of the islands (fee payable). No mooring or landing is permitted on the fourth which is a nature reserve.