Karl Henry Buesgen, Sr. (December 25, 1916 – December 14, 1981) was an American landscape painter and Pennsylvania impressionist typically associated with the Baum Circle, a group of artists either taught by, associated with, or directly influenced by Pennsylvania impressionist painter Walter Emerson Baum.

He was the only surviving son of Joseph Herman and Katherine (née Hörth) Buesgen, both second generation German immigrants who worked in Allentown's silk and textile mills.

Buesgen also actively worked as a piano, organ and voice teacher in Allentown, and served as organist and choirmaster for a number of local churches.

Buesgen was a dedicated student of painting, and studied with both Walter Emerson Baum (1884–1956) and John E. Berninger (1897–1981).

Like most impressionist painters, Buesgen painted landscapes en plein air (directly from nature) or from colored slides of photographs he took with his camera.