Trout Hall is a historic home located at Allentown in Lehigh County, Pennsylvania. It is one of the older homes in Allentown (1910 Walnut Street is the oldest), built between 1768 and 1770, and is a 2+1⁄2-story, stone dwelling in the Georgian style. It was built as a summer home by James Allen, the third son of William Allen, founder of Allentown. Today, it houses the library and museum of the Lehigh County Historical Society.