Abram Baldwin Olin (September 21, 1808 – July 7, 1879) was a U.S. Representative from New York. He subsequently served as an Associate Justice of the Supreme Court of the District of Columbia from 1863 to 1879.
Born in Shaftsbury, Vermont, Olin was the son of Gideon Olin, and the cousin of Henry Olin. Olin attended the common schools, and graduated from Williams College, Williamstown, Massachusetts, in 1835. He studied law with Albert Gallatin Whittemore of Milton, Vermont, and was admitted to the bar in 1838. He commenced practice in Troy, New York, and served as city recorder from 1844 to 1852.
Olin was elected as a Republican to the Thirty-fifth, Thirty-Sixth, and Thirty-Seventh Congresses (March 4, 1857 – March 3, 1863).
On March 10, 1863, Olin was nominated by President Abraham Lincoln to a new seat as an associate justice of the Supreme Court of the District of Columbia (now the United States District Court for the District of Columbia) created by 12 Stat. 762. He was confirmed by the United States Senate on March 11, 1863, and received his commission the same day. He voluntarily retired on January 13, 1879. He died near Sligo, Maryland, July 7, 1879. He was interred in the Danforth family lot adjacent to West Lawn Cemetery, Williamstown, Massachusetts.