Trout Hall is a historic home located at Allentown, Lehigh County, Pennsylvania. It is the oldest home in Allentown, 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.