HMS Vengeful was a Second World War British submarine of the V class.

Vengeful was built at Vickers Armstrong, Barrow-in-Furness, U.K. between July 1943 and July 1944.

Vengeful served in the RN from October 1944 to April 1945.

Vengeful was lent to the Greek Navy from April 1945 until 1957 where she served as Delfin (Y-9).

This article about a specific naval submarine of the United Kingdom is a stub.