The Diamondback was a proposed nuclear-armed air-to-air missile studied by the United States Navy's Naval Ordnance Test Station during the 1950s.

Intended as an enlarged, nuclear-armed version of the successful Sidewinder missile, Diamondback did not progress beyond the study stage.

In 1956, studies began at the Naval Ordnance Test Station (NOTS) at China Lake, California involving an advanced development of the AAM-N-7 (later AIM-9) Sidewinder air-to-air missile, which was then entering service with the United States Navy.

[1][2] Diamondback was intended to provide increased speed, range and accuracy over that achieved by Sidewinder.

[6] The propulsion system was intended to be a liquid-fueled, dual-thrust rocket,[5] using hypergolic, storable propellants.