HMCS Victoria is a long-range hunter-killer (SSK) submarine of the Royal Canadian Navy, the lead ship of her class.

They are equipped with two Paxman Valenta 1600 RPS SZ diesel engines each driving a 1.4-megawatt (1,900 hp) GEC electric alternator with two 120-cell chloride batteries.

In British service, the submarines were equipped with 14 Tigerfish Mk 24 Mod 2 torpedoes and four UGM-84 Sub-Harpoon missiles.

[3] In 2014, the Government of Canada purchased 12 upgrade kits that will allow the submarines to fire the Mk 48 Mod 7AT torpedoes.

[3] The submarine's keel was laid down as HMS Unseen at Cammell Laird's Birkenhead yard on 12 August 1987.

[8][9] Looking to discontinue the operation of diesel-electric boats, the British government offered to sell Unseen and her sister submarines to Canada in 1993.

[9] The submarine was commissioned into Maritime Command as Victoria at Halifax, Nova Scotia on 2 December 2000.

[9] Victoria was then transferred to Esquimalt, British Columbia, becoming the first Canadian submarine stationed in the Pacific since the 1974 decommissioning of HMCS Rainbow.

[11] Quoting a CBC News report from May 2006: Between 2000 and 2010, Victoria had only been at sea for 115 days;[11] and was expected to re-enter service in mid-2011, after six years in drydock.

[15] On 5 December 2011, Victoria departed Esquimalt Harbour to conduct sea trials and crew training.

[19][20] While participating in RIMPAC 2012 exercises, Victoria successfully fired a Mark 48 torpedo on 17 July 2012 striking and sinking the discarded USNS Concord.

[24] In late 2016, it was announced that all four submarines would reach the end of their service life before 2025 without a large-scale upgrade and refit program.