San King (Chinese: 新景) is one of the 31 constituencies in the Tuen Mun District.

Created for the 1994 District Board elections, the constituency returns one district councillor to the Tuen Mun District Council, with an election every four years.

San King loosely covers areas surrounding San Wai Court and Por Lo Shan in Tuen Mun with an estimated population of 13,772.