The 1863 United States Senate election in New York was held on February 3, 1863, by the New York State Legislature to elect a U.S. Senator to represent the State of New York in the United States Senate.

Edwin Denison Morgan was the 21st governor of New York from 1859 to 1862 and served in the United States Senate from 1863 to 1869. He was the first and longest-serving chairman of the Republican National Committee. He was also a Union Army general during the American Civil War. Morgan was known for his progressive views on education, prison reform, and women's suffrage. He helped to found the Republican Party in New York and was a strong supporter of the Presidency of Abraham Lincoln.