John O'Neill is a former American football player known for his position as a linebacker. He played in the National Football League (NFL) during the late 1970s and early 1980s. O'Neill was recognized for his strong defensive skills and ability to read plays, contributing to his team's overall performance on the field. After his playing career, O'Neill transitioned into coaching, where he applied his extensive knowledge of the game to develop young athletes. His experience in the NFL and dedication to the sport have made him a respected figure in the football community.