HMS Pembroke Castle was a Castle-class corvette built for the British Royal Navy during the Second World War.

Before completion, the ship was transferred to the Royal Canadian Navy and renamed HMCS Tillsonburg.

Though the Admiralty would have preferred Loch-class frigates, the inability of many small shipyards to construct the larger ships required them to come up with a smaller vessel.

This powered one vertical triple expansion engine that drove one shaft, giving the ships a maximum speed of 16.5 knots (30.6 km/h; 19.0 mph).

[2] The ships carried 480 tons of oil giving them a range of 6,200 nautical miles (11,500 km; 7,100 mi) at 15 knots (28 km/h; 17 mph).

[4] The Type 147B was tied to the Squid anti-submarine mortar and would automatically set the depth on the fuses of the projectiles until the moment of firing.

[7] The corvette, now renamed Tillsonburg for the town in southern Ontario, was commissioned on 29 June 1944 with the pennant number K496.