New Mexico State Defense Force

The New Mexico State Defense Force (NMSDF; Spanish: Fuerza de Defensa del Estado de Nuevo México), formerly the New Mexico State Guard (NMSG; Spanish: Guardia Estatal de Nuevo México), is part of the armed forces of the U.S. state of New Mexico. It is a reserve military force that works parallel to the state's National Guard. Authorized under the constitutions of the United States and New Mexico, the NMSDF is organized as an internal security and emergency services reserve force.

The New Mexico State Defense Force is one of three military divisions of the New Mexico Department of Military Affairs (DMA), along with the New Mexico Army National Guard and New Mexico Air National Guard. The DMA is headed by Adjutant General of New Mexico, who holds the rank of Major General, a Deputy Adjutant General, and three Assistant Adjutants General. The NMSDF falls under the direct supervision of the assistant adjutant general of New Mexico for state guard affairs, who holds the rank of Brigadier General. The Governor of New Mexico is commander-in-chief of the NMSDF, which unlike the New Mexico National Guard cannot be called to federal service and remains under exclusive state jurisdiction.

In September 2014, Brigadier General David Torres, then commander of the New Mexico State Defense Force, announced a restructuring and modernization plan, which would be followed by an intensified recruiting campaign.