Fort Phil Kearny was an outpost of the United States Army that existed in the late 1860s in present-day northeastern Wyoming along the Bozeman Trail.

The fort was located along the east side of the Bighorn Mountains in present-day northern Johnson County, approximately fifteen miles (24 km) north of Buffalo.

At an elevation of 4,700 feet (1,430 m) above sea level, Fort Phil Kearny was the largest of the three stockaded fortifications along the trail.

In 1966, NBC televised "The Massacre at Fort Phil Kearny" on the anthology series Bob Hope Presents the Chrysler Theatre.

[7] Fort Phil Kearny was also the subject of the 1951 movie Tomahawk starring Van Heflin, by Universal International (UI) Pictures.