Hugh Mercer (16 January 1726 – 12 January 1777) was a Scottish-born American military officer and physician who participated in the Seven Years' War and Revolutionary War. Born in Pitsligo, Scotland, he studied medicine in his home country and served with the Jacobite forces of Bonnie Prince Charlie, participating in the Battle of Culloden in 1746. With the failure of the Jacobite rising, Mercer escaped to Pennsylvania.