HMS Pyramus was a Pelorus-class protected cruiser of the Royal Navy.

While well armed for their size, they were primarily workhorses for the overseas fleet on "police" duties and did not serve with the main battlefleet.

With reciprocating triple expansion engines and a variety of boilers, the top speed was 20 knots (37 km/h).

HMS Pyramus was laid down at Palmers Shipbuilding and Iron Company, Jarrow in May 1896, and launched on 15 May 1897.

In July 1915 she was present at the Rufiji river delta action when the monitors HMS Severn and HMS Mersey destroyed the German cruiser SMS Königsberg.