Tuen Mun New Town (formerly Castle Peak New Town), commonly referred to simply as Tuen Mun, is a satellite town of Hong Kong. It is one of the new towns that were developed by the Hong Kong Government in the New Territories from the 1960s. It was built around the existing rural local centre of Tuen Mun (a.k.a. Castle Peak). The new town covers most of the urban area of Tuen Mun District.