HMS Inconstant was one of eight Arethusa-class light cruisers built for the Royal Navy in the 1910s.

Inconstant was powered by four Parsons steam turbines, each driving one propeller shaft, which produced a total of 40,000 indicated horsepower (30,000 kW).

The turbines used steam generated by eight Yarrow boilers which gave her a speed of about 28.5 knots (52.8 km/h; 32.8 mph).

[5] The main armament of the Arethusa-class ships was two BL 6-inch (152 mm) Mk XII guns that were mounted on the centreline fore and aft of the superstructure and six QF 4-inch Mk V guns in waist mountings.

She survived the battle and the First World War, and was sold for scrapping on 9 June 1922 to Cashmore, of Newport.