James Clark Strong (May 26, 1826–1915) was a Union Army officer during the American Civil War and a prominent New York attorney in the post-war period. An advocate for Native Americans, he litigated That Portion of the Cayuga Indians Residing in Canada v. State (N.Y. 1885)[1] and Seneca Nation of Indians v. Christy (U.S. 1896)[2] on behalf of the Cayuga and Seneca, respectively, two of the earliest litigations of aboriginal title in New York.