The American Labor Party was a socialist political party in the United States active almost exclusively in the state of New York. It was formed in 1936 and its members were particularly interested in the rights of workers. Its most successful politician was Vito Marcantonio, who served in the United States House of Representatives from 1939 to 1951. From 1948 until 1949, the ALP had two seats in the House, as Leo Isacson joined Marcantonio after winning a special election early in 1948, but he was defeated in the general election that year.

The ALP's most common strategy was to co-endorse the candidate of one of the major parties, although, as in the case of Marcantonio and Isacson, it would also sometimes run its own candidates. It was able to elect some of its own candidates by trading support for major party candidates (often Republicans) with the major parties for support of their candidates.

In 1936, 1940, and 1944, the ALP endorsed Franklin Delano Roosevelt for president of the United States. In 1948, rather than support Harry Truman, it backed Progressive Party candidate Henry A. Wallace. By the 1950s, the ALP had lost much of its support to the rival Liberal Party of New York, in part because of accusations of communist influence in the ALP. In 1952, the party nominated lawyer Vincent Hallinan for president, but he attracted little support. After a disappointing campaign for governor in 1954, the ALP lost access to the ballot, and in 1956, it voted itself out of existence.