New York's 40th congressional district

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.

Past components
1953–1973:
 * All of Niagara
 * Parts of Erie

1945–1953:
 * Parts of Monroe

1913–1945:
 * All of Niagara
 * Parts of Erie

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