The Blackburn Perth was a British flying boat which served during the interwar period.

The Blackburn R.B.3A Perth was designed to replace the earlier Iris to Air Ministry Specification 20/32.

Unusually, in addition to its standard armament, the Perth was fitted with a Coventry Ordnance Works C.O.W 37 mm (1.46 in) autocannon in its bows.

[1] Perths remained in service until 1937,[1] being replaced by the Short Singapore and the Saro London.

Data from Aircraft of the Royal Air Force 1918–57[1]General characteristics Performance Armament