Eli Porter Ashmun (June 24, 1770 – May 10, 1819) was a Federalist United States Senator from Massachusetts from 1816 to 1818.
He was born in the vicinity of Fort Edward, New York, from whence the family fled in 1777 during the advance of British troops of John Burgoyne in the Saratoga campaign of the American Revolutionary War.
Ashmun's education was quite rudimentary, but he was taken under wing by Theodore Sedgwick, who gave him legal training.
In 1807, Ashmun was awarded an honorary degree by Middlebury College, and moved to Northampton where he continued his law practice.
He died in 1819, possibly of heart disease, and is interred in Northampton's Bridge Street Cemetery.