VAH-21, nicknamed the Roadrunners, was a short-lived Heavy Attack Squadron of the United States Navy, based at Naval Station Sangley Point, Philippines.

The squadron flew the specialized AP-2H version of the Lockheed P-2 Neptune aircraft, of which four examples were converted from standard SP-2H airframes.

Its mission was to interdict logistics moving over land or sea.

A detachment of VAH-21 was immediately established at a Navy facility associated with Cam Ranh Air Base, South Vietnam.

[1] This article incorporates text from the public domain Dictionary of American Naval Aviation Squadrons.