HMS Splendid was a third-batch S-class submarine built for the Royal Navy during World War II.

[5] HMS Splendid was a third-group S-class submarine and was ordered as part of the 1941 Naval Programme on 14 October 1940.

[8] After a period of training, Splendid departed Holy Loch on 3 October 1942, together with her sister ship, HMS Sibyl.

After ten days at sea, Splendid spotted smoke shortly after midday and gave chase to the unidentified ship; four hours later, she stopped and boarded the vessel, which turned out to be the Allied Gaizka, running behind schedule.

[7] The submarine again departed port on 7 November to patrol off Toulon; she was transferred the following week to operate off Naples instead.

Later that day, the British submarine surfaced and sank with gunfire the Italian anti-submarine schooner San Paolo northwest of Gorgona, Italy.

[7] The torpedo hit and damaged Velite, but the unexpected presence of two additional destroyers foiled the planned surface attack.

While returning from her patrol on 23 November, Splendid encountered the Italian merchant Favorita northwest of Sardinia and sank her with gunfire on the surface, having expended all of her torpedoes.

After patrolling for four days, the boat landed two Special Operations Executive men on Sardinia's eastern coast.

On 15 January, Splendid sighted an Italian convoy and fired five torpedoes at the merchant ship Emma, which was transporting 950 tons of supplies and ten tanks.

Splendid's commanding officer, Lieutenant McGeoch, was awarded the Distinguished Service Order following this patrol.

[7] The destroyer made three attack runs with depth charges, dropping 41 in total; Splendid attempted to escape by diving to 500 feet (150 m), but the last eleven depth charges started leaks inside the submarine's pressure hull, and the boat was forced to surface.

She was fired upon by the destroyer's surface guns, which killed 18 crew members and wounded the commanding officer.

Splendid was scuttled to prevent her capture by enemy forces, and her surviving crew were imprisoned in Italian prisoner-of-war camps.

[9] During her service with the Royal Navy, Splendid sank eight Axis ships as well as an Italian destroyer for a total of 25,234 GRT.