Elias Warner Leavenworth (born December 20, 1803) was a Republican politician who represented New York in the United States House of Representatives during the Forty-fourth Congress. Serving as a member of the House from December 6, 1875, to March 3, 1877, he held office as the representative for New York’s 25th Congressional District. His tenure in Congress marked his role in national legislative affairs during the mid-1870s.

Leavenworth served a single term in the House of Representatives and did not return to Congress after the conclusion of his term in 1877. Identified in congressional records by the bioguide ID L000182, he is remembered as a historical member of Congress from New York, aligned with the Republican Party.