William Swan Plumer (July 26, 1802 – October 22, 1880) was an American clergyman, theologian and author who was recognized as an intellectual leader of the Presbyterian Church in the 1800s.
From 1837 to 1845 Plumer was the editor of The Watchman of the South, a weekly Presbyterian newspaper which he had founded while serving as pastor in Richmond.
Plumer authored at least 25 books, including commentaries on Romans, Hebrews, and Psalms, as well as numerous tracts and pamphlets, and magazine and newspaper articles.
Plumer died in Baltimore on October 22, 1880, due to complications which arose after having surgery to remove kidney stones.
In 1829 Plumer married a widow, Eliza Garden Hassell, in Hillsboro, North Carolina.