Peacock was a fifth-rate warship of the Commonwealth of England's naval forces, the third of three such ships captured from Royalist forces during 1651 (the other two were and ). She was formerly the Royalist "Falcon", captured from them in October 1651 by the fourth rate "Tiger" and renamed after the "Tiger"s commander, Captain James Peacock.
While fitted out as an 18-gun Fifth Rate, the "Peacock" was not recorded as commissioning at any time, and was sold by November 1658.