Perranuthnoe is a civil parish and a village in southwest Cornwall, United Kingdom. The village is situated on the east side of Mount's Bay approximately one mile (1.6 km) east of Marazion and four miles (6.5 km) east of Penzance.
The parish includes the villages of Perranuthnoe, Goldsithney, Perran Downs and part of Rosudgeon. It takes its name from the church, dedicated to St Piran (and St Michael), combined with the name of the manor, Uthno.
For local government Perranuthnoe elects a parish council every four years. The principal local authority is Cornwall Council.