Trimountain is a traprock mountain in Connecticut, United States.
Trimountain or Tri-Mountain may also refer to:
Tri-Mountain State Park, the state park that encompasses Trimountain in Connecticut Trimountain, Michigan, a census-designated place in the United States Tri-Mountain National Scenic Area, a national scenic area in central Taiwan
See also Three Peaks (disambiguation) Tri Peaks (disambiguation) Trio Mountain