The 1818 United States House of Representatives elections in New York were held from April 28 to 30, 1818, to elect 27 U.S. Representatives to represent the State of New York in the United States House of Representatives of the 16th United States Congress.
Background.
27 U.S. Representatives had been elected in April 1816 to a term in the 15th United States Congress beginning on March 4, 1817. Representative-elect Henry B. Lee died on February 18, 1817, and James Tallmadge, Jr. was elected in April 1817 to fill the vacancy. The representatives' term would end on March 3, 1819. The congressional elections were held together with the State elections in late April 1818, about ten months before the term would start on March 4, 1819, and about a year and a half before Congress actually met on December 6, 1819.
Congressional districts.
The geographical area of the districts remained the same as at the previous elections in 1816. Two new counties were created: Tompkins inside the 20th District; and Cattaraugus inside the 21st District. In 1817, the Town of Danube was separated from the Town of Minden in Montgomery County, and transferred to Herkimer County, but Danube remained in the 14th District. 
Result.
19 Democratic-Republicans, 6 Clintonian-Federalists and 2 Federalists were elected to the 16th Congress. The incumbents Wendover, Tompkins, Taylor and Storrs were re-elected, the incumbent Ellicott was defeated.
Aftermath and contested election.
The House of Representatives of the 16th United States Congress met for the first time at the reconstructed United States Capitol in Washington, D.C., on December 6, 1819, and 26 of the representatives took their seats. Only Ebenezer Sage did not appear.
On December 10, Nathaniel Allen presented a petition on behalf of James Guyon, Jr. to contest the election of Ebenezer Sage in the 1st District. On January 12, 1820, the Committee on Elections submitted its report. They found that the election inspectors in the towns of Northfield (on Staten Island), Brooklyn, Hempstead and Oyster Bay had returned 391 votes for "James Guyon" although all these votes had in fact been given for "James Guyon, Jr." The Secretary of State of New York, receiving the abovementioned result, issued credentials for Sage who never took or claimed the seat. On January 14, the House declared Guyon, Jr., entitled to the seat, and Guyon took it.