The SIG Sauer M17 and M18 are service pistols used by the United States Armed Forces.

On January 19, 2017, the United States Army announced that a customized version of the SIG Sauer P320 had won the Army's XM17 Modular Handgun System competition. The full-sized model is known as the M17, and the smaller-sized carry model is known as the M18.[3] There are 2 color variants, coyote tan and black, for both the M17 and M18.