| Unit Name: | Helicopter Maritime Strike Squadron Four Six |
| Country: |  United States |
| Type: | Navy Helicopter Squadron |
| Role: | Anti-submarine warfare (ASW) Anti-surface warfare (ASUW) Search and rescue (SAR) Medical evacuation (MEDEVAC) Vertical replenishment (VERTREP) Naval Surface Fire Support (NSFS) Communications Relay (COMREL) |
| Size: | 300 |
| Command Structure: | Carrier Air Wing 7 |
| Garrison: | Naval Air Station Jacksonville |
| Nickname: | Grandmasters |
| Motto: | Set the standard |
| Mascot: | Knight (chess piece) |
| Battles: | Operation Enduring Freedom Operation Iraqi Freedom Global War on Terror |
| Anniversaries: | Established at Mayport, Florida, on 7 April 1988 |
| Website: | http://www.public.navy.mil/airfor/hsm46/ |
| Commander1: | CDR Anne "BOB" Bruckman |
| Commander1 Label: | Commanding Officer |
| Commander2: | CDR Andrew "Megan" Howerton |
| Commander2 Label: | Executive Officer |
| Commander3: | CMDCM Cory Ervin |
| Commander3 Label: | Command Master Chief |
| Aircraft Helicopter Multirole: | MH-60R Seahawk MH-60R Seahawk |
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. A detachment normally consists of one or two aircraft, five to six pilots, two to three sensor operators, a maintenance chief, and eight to twelve maintenance personnel. A typical detachment deploys with its assigned ship for six months, with several shorter work-up cruises prior to the long deployment. The squadron is directly responsible to Commander, Helicopter Maritime Strike Wing, U.S. Atlantic Fleet.
The squadron is currently assigned to Carrier Air Wing 7 on board the aircraft carrier, replacing HSM-79.
HSL-46 was re-designated HSM-46 in March 2012 at Naval Station Mayport.