HMS H2

HMS H2 was a British H-class submarine built by Canadian Vickers, Montreal.

She was laid down on 11 January 1915 and was commissioned on 4 June 1915. After commissioning, H2 crossed the Atlantic from St. John's, Newfoundland to Gibraltar escorted by the armed merchant cruiser HMS Calgarian (1913). She was accompanied by HMS H1, HMS H3 and HMS H4.

H2 was sold in Malta on 7 March 1921.