HMS Alcide (P415), was an Amphion-class submarine of the Royal Navy, built by Vickers-Armstrongs and launched 12 April 1945.

It also contained four electric motors each producing 625 horsepower (466 kW) that drove two shafts.

[3] When submerged, it could operate at 3 knots (5.6 km/h; 3.5 mph) for 90 nautical miles (170 km; 100 mi) or at 8 knots (15 km/h; 9.2 mph) for 16 nautical miles (30 km; 18 mi).

[2] Alcide was fitted with ten 21 inches (530 mm) torpedo tubes, one QF 4 inch naval gun Mk XXIII, one Oerlikon 20 mm cannon, and a .303 British Vickers machine gun.

[2] In 1952 Alcide deployed to Canada for anti-submarine training with the Royal Canadian Navy.