The Texas Military Forces (TXMF) are the principal instrument through which the Texas Military Department (TMD) executes security policy for Texas, which has the second-largest population and border in the United States.

The Texian Militia was the militia forces of Texian colonists in the Mexican state of Coahuila y Tejas from 1823 to 1835 and the inaugurate force of the Texas Military. It was established by Stephen F. Austin on August 5, 1823 for defense of the Old Three Hundred colonists against the Karankawa, Comanche, and Cherokee tribes; among others. Its most notable unit, the Texas Rangers, remained in continuous service of Texas Military Forces until 1935.