On Deadly Ground is a 1994 American environmental action adventure film directed, co-produced by, and starring Steven Seagal, and co-starring Michael Caine, Joan Chen, John C. McGinley and R. Lee Ermey. As of 2024, it is Seagal's only directorial effort and features a minor appearance by Billy Bob Thornton in one of his early roles. Seagal plays Forrest Taft, an expert firefighter who chooses to fight back against the environmental destruction caused by his ruthless former employer (Caine). On Deadly Ground was theatrically released in the United States on February 18, 1994, by Warner Bros. It garnered negative reviews from critics and grossed $78.1 million worldwide on a $50 million production budget.

Ronald Lee Ermey was an American actor and U.S. Marine drill instructor. He achieved fame for his role as Gunnery Sergeant Hartman in the 1987 film Full Metal Jacket, which earned him a Golden Globe nomination for Best Supporting Actor. Ermey was also a United States Marine Corps staff sergeant and an honorary gunnery sergeant.