The 1864 New York gubernatorial election was held on November 8, 1864. Incumbent Governor Horatio Seymour ran for re-election to a second consecutive term in office but was defeated by National Union candidate Reuben E. Fenton.
The National Union state convention met on September 7 in Syracuse.
The Democratic state convention met on September 14 and 15 in Albany. Governor Seymour was re-nominated by acclamation.