The Type 61 Salisbury class were a class of four British aircraft direction (AD) (or radar picket) frigates built for the Royal Navy.
These ships were related to the Type 41 Leopard class frigates, but with reduced armament (one twin 4.5 inch mount vice two) to make way for more aircraft direction equipment, particularly the four-ton radar antenna of the Type 965 (AKE-2). Unlike the four Battle class AD conversions, the primary role of the Type 61 was not operations with fast carrier groups, for which their diesel power plant lacked the speed. The role of the Type 61 was as a seaworthy air ocean surveillance ship and air control ship to escort slow task forces, such as amphibious task forces. By the end of 1978 all had been relegated to non-combat roles, with one sold to Bangladesh.