Charles Salis Kaelin was an American impressionist painter.

He studied under John Henry Twachtman between 1876 and 1879, after which time he moved to New York City and joined the Art Students League of New York. In 1893 he returned to Cincinnati and worked as a designer for several lithography companies. He moved to Rockport, Massachusetts in 1916, where he painted landscapes and ships. His work is in the collection of the Cincinnati Art Museum, where he exhibited regularly throughout his career.