The British 5th Destroyer Flotilla, or Fifth Destroyer Flotilla, was a naval formation of the Royal Navy from 1910 to 1942 and again from 1947 to 1951.

HMS Malcolm was one of eight Admiralty-type destroyer leaders built for the Royal Navy during World War I. She was the first of only two Royal Navy ships to carry the name Malcolm, although HMS Valkyrie was originally planned to bear the name. She was one of two Admiralty-type leaders to miss the First World War but saw service in, and survived, the Second World War. Her pennant number was changed from D19 to I19 in May 1940. She was broken up in 1945.