Charles Otis Gill (March 4, 1868 – June 2, 1959) was an American Congregationalist clergyman. With Gifford Pinchot he co-authored two influential books on the state of rural churches in the United States.
In addition to his accomplishments on the gridiron for Yale, Gill attended the Yale Divinity School from 1889–90, then the Union Theological Seminary in New York City from 1892–94, where he received his graduate degree and was ordained as a minister in the Congregational Church on July 25, 1894. He served as pastor of the Westmore, Vermont Congregational Church in 1894 and 1895 and then as a foreign missionary for the Presbyterian Church in Peking, China, in 1895-97. He returned to Vermont and served in East Fairfield, Vermont, 1897–98; Westmore, Vermont, 1898–1902; Jericho, Vermont, 1902–04; West Lebanon, New Hampshire, 1904–06; and Hartland, Vermont from 1906-09. Remaining in Harland he collaborated with his Yale football teammate Gifford Pinchot in writing The Country Church - The Decline Of Its Influence and The Remedy published by Macmillan Company in 1913. This led to his appointment as the Secretary of the Committee on Church & Country Life, Social Service Commission, Federal Council of Churches, in Columbus, Ohio, from 1913 to 1919. In that capacity he wrote a second book with Pinchot, Six Thousand Country Churches, published by MacMillan in 1919. While in Ohio he was also Secretary of the Ohio Rurual Life Association, a member of the Commission on Interchurch Cooperation, and Supervisor of rural church survey work for the Interchurch World Movement.
He returned to Vermont as pastor in Hartland until his retirement in 1929, when he relocated to Waterford, Vermont and took up farming. He remained in Waterford until his death on June 2, 1959.