Amasa Junius Parker (June 2, 1807 – May 13, 1890) was an attorney, politician and judge from New York. He is most notable for his service as a member of the New York State Assembly (1834), a U.S. Representative (1837-1839), and a justice of the New York Supreme Court. Parker died in Albany on May 13, 1890. He was buried at Albany Rural Cemetery.