Frontier, a political and geographical term referring to areas near or beyond a boundary, or of a different nature

Frontier Thesis, the theory about the meaning of the American frontier

Digimon Frontier, the fourth season of the Digimon series.

Frontier Airlines, a low-cost airline based at Denver International Airport in Denver, Colorado, United States

Frontier (computer game), a computer game written by David Braben and published by Gametek

Nissan Frontier, a small/midsize pickup truck produced by Nissan Motors

New Frontier Hotel and Casino, formerly a hotel and casino located on the Strip in Las Vegas, Nevada

Boundary (topology), also called a "frontier", the set of points which can be approached both from S and from outside of S

Frontier County, Nebraska

Frontier, North Dakota, a place in North Dakota

Frontier Records, a record label

Frontier (company), a telephone company that provides service serving rural communities in 24 states of the United States

Frontier (pinball), a pinball game manufactured by Bally

Frontier Developments, a British computer and video games development company

Frontiers Records, a record label

Frontier, Saskatchewan, a village in Saskatchewan

Frontier No. 19, a rural municipality in the Canadian province of Saskatchewan.