The 40th congressional district of New York was a congressional district for the United States House of Representatives in New York. It was created in 1913 as a result of the 1910 census. It was eliminated in 1973 as a result of the 1970 redistricting cycle after the 1970 United States census. It was last represented by Henry P. Smith III who was redistricted into the 36th district.

1953–1973:

All of Niagara

Parts of Erie

1945–1953:

Parts of Monroe

1913–1945:

All of Niagara

Parts of Erie

The following chart shows historic election results. Bold type indicates victor. Italic type indicates incumbent.

• Martis, Kenneth C. (1989). The Historical Atlas of Political Parties in the United States Congress. New York: Macmillan Publishing Company.
• Martis, Kenneth C. (1982). The Historical Atlas of United States Congressional Districts. New York: Macmillan Publishing Company.
• Congressional Biographical Directory of the United States 1774–present
• Election Statistics 1920–present Clerk of the House of Representatives

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