HMS Ocelot (S17) is an Oberon-class diesel-electric submarine which was operated by the Royal Navy.

The Oberon class was a direct follow-on of the Porpoise-class, with the same dimensions and external design, but updates to equipment and internal fittings, and a higher grade of steel used for fabrication of the pressure hull.

[2] Propulsion machinery consisted of two Admiralty Standard Range 16 VMS diesel generators, and two 3,000 shaft horsepower (2,200 kW) electric motors, each driving a 7-foot-diameter (2.1 m) three-bladed propeller at up to 400 rpm.

[citation needed] After commissioning, Ocelot was assigned to the 3rd Submarine Squadron, based at HMNB Clyde, in Faslane, serving there for three years.

[4] Ocelot attended the 1977 Silver Jubilee Fleet Review off Spithead when she was part of the Submarine Flotilla.