Gilbert A. Deane (June 2, 1851 Chapinville, Litchfield County, Connecticut – November 20, 1891 Copake, Columbia County, New York) was an American politician from New York.
Deane married Minnie J. Andrews (1855–1932), and they had several children.
Deane was a Republican member of the New York State Assembly (Columbia Co.) in 1884.
In November 1891, he ran for re-election but the State Board of State Canvassers (the Democratic state officers) declared his opponent Edward B. Osborne elected despite receiving fewer votes than Deane.
Deane died on November 20, 1891, less than three weeks after the election, at his home in Copake, from "congestion of the brain" attributed to "overexertion during the election campaign".