Mawnan (Cornish: Sen Mownan) is a civil parish in south Cornwall, England, United Kingdom. It is situated in the former administrative district of Kerrier and is bounded to the south by the Helford River, to the east by the sea, and to the west by Constantine parish. The population was 1,454 in the 2001 census.
The church town of the parish is Mawnan Church, also known simply as Mawnan, but the only large village in the parish is Mawnan Smith, situated approximately three miles south of Falmouth.