HMCS Okanagan (S74) was an Oberon-class submarine that served in the Canadian Forces (CF).
Okanagan was laid down on 25 March 1965 at Chatham Dockyard, Chatham, England and launched on 17 September 1966. She was commissioned into the CF on 22 June 1968 with pennant number 74.
In July 1973, Okanagan collided with the Royal Fleet Auxiliary vessel Grey Rover while exercising in British waters. Fortunately, there were no injuries to the submarine's crew.
Okanagan participated in the filming of the Japanese disaster film Fukkatsu no hi, released in 1980; one of her officers was given a small speaking role.
She was decommissioned from Maritime Command (MARCOM) on 14 September 1998. She had served her entire career with Maritime Forces Atlantic (MARLANT) in the North Atlantic.
Okanagan is laid up at CFB Halifax awaiting disposal.
Built in the UK on order by the RCN.