MacNeil Mitchell (July 18, 1904 – December 17, 1996) was an American lawyer and politician from New York.
He was born on July 18, 1904, in Lime Rock, Litchfield County, Connecticut, the son of George Henry Mitchell and Harriet (MacNeil) Mitchell. He graduated from Yale College in 1926; attended Columbia Law School, and graduated from UC Berkeley School of Law in 1929. He practiced law in New York City. In 1938, he married Katherine McGowin, and they had three children.
Mitchell was a member of the New York State Assembly from 1938 to 1946, sitting in the 161st, 162nd, 163rd, 164th and 165th New York State Legislatures.
He was a member of the New York State Senate (20th district) from 1947 to 1964, sitting in the 166th, 167th, 168th, 169th, 170th, 171st, 172nd, 173rd and 174th New York State Legislatures; and was Chairman of the Committee on the Judiciary in 1963 and 1964.