The Pleasant Grove School, also known as Mud College, is a historic one-room school building located at Mount Joy Township, Adams County, Pennsylvania. It was built in 1869, and is a one-story gable-front brick building. Also on the property is one contributing outhouse, built in 1951. The school closed in 1949, and is owned by the township and operated as a living history museum.
It was listed on the National Register of Historic Places in 2012.