John Clark is a former professional footballer from Scotland, known for his defensive skills on the field. He played primarily as a defender and had a notable career in the Scottish Football League and English Football League. During his time, Clark represented several clubs, including Celtic FC and Dunfermline Athletic. He was recognized for his strong tackling and ability to read the game, contributing to his teams' successes in various competitions. After retiring from professional play, he remained involved in football through coaching and mentoring young players.