HMS Sahib was a third-batch S-class submarine built for the Royal Navy during the Second World War. She was launched on 19 January 1942 and commissioned on 13 May 1942. She was the only British naval vessel to bear the name Sahib. On 24 April 1943, Sahib sank a heavily protected Italian merchant; however, she was then attacked with depth charges and forced to surface. The crew of Sahib were evacuated and rescued with only one casualty by the Italian ships while the submarine was scuttled and sank.