Hugh Weedon Mercer (November 27, 1808 – June 9, 1877) was an officer in the United States Army and then a Confederate general during the American Civil War.

His grandfather and namesake Hugh Mercer of Scotland had been a general under George Washington during the American Revolution.

He started building the Italianate-style Mercer House on the western side of Monterey Square in Savannah.

In August 1862, he played a major role in impressing the first group of slaves and free blacks into service for the Confederacy.

By November, however, he lost his authority to impress workers, and depended on Governor Joseph E. Brown and local sheriffs to provide slaves to join the Confederate effort.

Mercer was considered to be a good officer, but was unable to endure the physical demands of active duty.

He was briefly imprisoned on at Fort Pulaski, which he had once commanded, on Cockspur Island after the end of the war, along with other prominent Confederate leaders.