Breidenhart is a historic castle-like house built in 1894 by Samuel Leeds Allen and located at 255 East Main Street in Moorestown, New Jersey. It was added to the National Register of Historic Places on December 22, 1977, for its significance in art, architecture, commerce, and music. It was added as a contributing property to the Moorestown Historic District in 1990. The building is now owned by the Lutheran Social Ministries of New Jersey.