November 1804 United States Senate special election in New York

The second 1804 United States Senate special election in New York was held on November 9, 1804, by the New York State Legislature to elect a U.S. Senator (Class 1) to represent the State of New York in the United States Senate.

Background
John Armstrong had been elected for this seat (term 1803–1809) in February 1804, after the resignation of Theodorus Bailey. Armstrong took his seat on February 25, but resigned on June 30, 1804, after his appointment as U.S. Minister to France.

At the State election in April 1804, the Democratic-Republican Party won a large majority in the Assembly, and all 8 State Senate seats up for election. The 28th New York State Legislature met from November 6 to 12, 1804; and from January 23 to April 10, 1805, at Albany, New York.

Candidates
Congressman Dr. Samuel L. Mitchill was the candidate of the Democratic-Republican Party.

Ex-U.S. Senator Rufus King was the candidate of the Federalist Party.

Result
Mitchill was elected.

Mitchill took his seat on November 23, 1804, and served until the end of the term on March 3, 1809.