Cumston Hall is a historic community building at 796 Main Street in downtown Monmouth, Maine. Built in 1900, it is one of the most flamboyant examples of wooden Romanesque architecture to be found in a small-town setting in the entire state. It was a gift to the town of Dr. Charles M. Cumston, and presently houses the local public library and local theatrical companies. It was listed on the National Register of Historic Places in 1973.