Divisions Mount Ellis Academy is a co-educational private high school (grades 9 through 12) located about 5 miles (8.0 km) east of Bozeman, Montana, United States.

Ellis Academy includes boys and girls dormitories, an Administration building, gymnasium, and other facilities.

Ellis operates a ski area on US Forest Service land about 3 miles (4.8 km) from the school in Bear Canyon.

In recent decades enrollment has trended downward and stood at about 70 students for the 2005- 2006 school year.

According to a 2001 report, out of over 100 private schools in Montana, Mount Ellis was one of only ten accredited under state education standards.