Thomas Beaver Free Library and Danville YMCA is a historic library and YMCA located at Danville, Montour County, Pennsylvania. The two attached buildings were built in 1886. They are 2+1⁄2-story, sandstone buildings with slate roofs in a combined Queen Anne / Second Empire style. The buildings feature an octagonal cupola, corbelled stone chimneys, a hipped roof tower, and terra cotta ornament.

It was added to the National Register of Historic Places in 1987.