James M. "Jim" Foster (November 19, 1934 – October 31, 1990) was an American LGBT rights and Democratic activist. Foster became active in the early gay rights movement when he moved to San Francisco following his undesirable discharge from the United State Army in 1959 for being homosexual. Foster co-founded the Society for Individual Rights (SIR), and early homophile organization, in 1964.

The Division of Rare and Manuscript Collections at Cornell University Library has has papers.