The Rockingham Hotel is a historic hotel building in Portsmouth, New Hampshire. It was originally built in 1785 as a residence by Woodbury Langdon, prominent merchant and politician. Thomas Coburn converted it into a hotel which opened November 1, 1833. Frank Jones, who was, among other things, mayor of Portsmouth, a US Representative, and a brewer, bought it in 1870. After a fire in 1884, Jones rebuilt it extensively. The only significant part saved from Langdon's mansion was the dining room, which is now the Library Restaurant.