HMS Rising Castle was a Castle-class corvette built for the Royal Navy in World War II.

Before she was commissioned she was transferred to the Royal Canadian Navy and renamed Arnprior and given a new pennant number.

This powered one 4-cylinder triple-expansion engine, driving one shaft, giving the Castle-class corvettes a maximum speed of 16.5 knots (30.6 km/h; 19.0 mph).

[3] The corvettes could carry 480 tons of oil[3] giving them a range of 9,500 nautical miles (17,600 km) at 10 knots (19 km/h; 12 mph).

She was launched on 8 February 1944, but was then transferred to the Royal Canadian Navy and commissioned as HMCS Arnprior (with a new pennant number) on 8 June 1944.