Fort Craig, Military fort in Socorro County, New Mexico

Fort Craig is a former U.S. Army post on a bluff above the Rio Grande in Socorro County, New Mexico, measuring about 320 by 180 metres within roughly 40 acres. The 3rd U.S. Infantry Regiment began building it in 1853, and troops moved in from Fort Conrad in 1854. Its gravel bastions once held real cannon alongside wooden "Quaker guns" topped with soldiers' caps.

The United States Army built the fort in 1854 to protect settlers and travelers along the El Camino Real from Apache and Navajo attacks. The post later became important during the Civil War and saw major confrontations between Union and Confederate forces.

The fort's name honors Captain Louis S. Craig, a Mexican–American War officer murdered by deserters in California in 1852. In July 1861 over 2,000 soldiers made it the largest fort in the Southwest, and New Mexico Volunteers, including Hispanic and Native American recruits under Colonel Miguel Pino, served here. Pino's men burned the Confederates' supply wagons after the Battle of Valverde.

Fort Craig Historic Site is run by the Bureau of Land Management, with a visitor center on site. It lies between Exits 115 and 124 off Interstate 25, 32 miles (52 km) south of Socorro and 105 miles (170 km) north of Las Cruces. The ruins sit on a bluff above the Rio Grande, so expect sun and wind with little shade.

The fort's gravel bastions were lined with "Quaker guns" — wooden fake cannons with soldiers' caps set beside them — alongside real artillery and troops. The ruse helped dissuade Sibley from a direct assault in 1862. The Battle of Valverde itself was fought at a Rio Grande crossing just north of the fort.