Glorieta Pass Battlefield, Civil War battlefield in Santa Fe County, United States.

Glorieta Pass Battlefield preserves two parcels of the 1862 battlefield: 294 acres on the west side of the pass, between Interstate 25 and the railroad near Cañoncito, and 150 acres on the east side, north of I-25 and crossed by New Mexico State Road 50 along the old Santa Fe Trail. At the eastern end stand the foundation remnants of Pigeon's Ranch.

The battle arose from a Confederate push to control the West. In February 1862 Henry H. Sibley's forces beat Edward Canby at Valverde and reached Santa Fe. Colorado volunteers under William Gilpin and New Mexican volunteers led by Lt. Col. Manuel Chaves marched to defend Fort Union. On March 26–28, 1862, the fighting was largely indecisive and the Union troops retreated north, but they destroyed the Confederate supply train, forcing a retreat to Texas.

This site marks where two armies clashed over control of supply routes and westward expansion during the Civil War. Today, visitors can see how geography shaped military decisions and what this battle meant for the region's future.

Access is through Pecos National Historical Park, which offers walking paths and signs explaining locations. Good hiking shoes are helpful since the terrain is hilly and uneven in places.

Ruins of Pigeon's Ranch remain on the grounds, a stop along the Santa Fe Trail that served as a fortified position during the fighting. This location became crucial to the three-day conflict's outcome.