The Spark is a small Trotskyist group in the United States. It was founded in 1971 by supporters of Lutte Ouvriere around Kay Ellens as a split from the Spartacist League and have since closely followed the policies of the Internationalist Communist Union (Trotskyist). It places a great emphasis on doing factory-based work and remains a very small group confined to a few cities. It produces a bi-monthly magazine called Workers' Struggle and a paper, Spark.