Helicopter Maritime Strike Four Six (HSM-46), the "Grandmasters", are a United States Navy helicopter squadron based at Naval Air Station Jacksonville, Florida.

HSM-46 deploys aboard cruisers, destroyers, and aircraft carriers in independent operations or in support of strike groups.

[1] The squadron was established on 7 April 1988 as Helicopter Antisubmarine Squadron (Light) Forty Six (HSL-46) HSM-46 deploys Light Airborne Multi-Purpose System (LAMPS) program helicopters to United States Navy warships performing search and rescue, vertical replenishment, medical evacuation, and communications relay and combat missions.

Established at Mayport, Florida, on 7 April 1988, HSM-46 currently deploys ten detachments aboard Atlantic Fleet ships.

The squadron is directly responsible to Commander, Helicopter Maritime Strike Wing, U.S. Atlantic Fleet.