HMS Odin (N84) was an O-class submarine of the Royal Navy. She was laid down by HM Dockyard at Chatham in Kent on 23 June 1927, launched on 5 May 1928 and commissioned on 21 December 1929. She served with the 5th Flotilla at Portsmouth in 1929-1930, with the 4th Flotilla at Hong Kong from 1930-1939, with the 8th Flotilla at Colombo in Ceylon in 1939-1940, and with the 1st Flotilla at Alexandria in Egypt in 1940. Odin was depth charged and later rammed on surface by the Italian Freccia-class destroyer Strale and the Folgore-class destroyer Baleno and sank in the Gulf of Taranto on 13 June 1940.