The 63rd New York State Legislature, consisting of the New York State Senate and the New York State Assembly, met from January 7 to May 14, 1840, during the second year of William H. Seward's governorship, in Albany.

The 1839—1840 United States Senate election in New York was held on February 5, 1839 and January 14, 1840. Incumbent Senator Nathaniel P. Tallmadge was re-elected to a second term in office over scattered opposition.