St Winnow is a civil parish in Cornwall, England, United Kingdom. Its name may be connected with either that of Saint Winnoc or Saint Winwaloe. It has a population of 304, which had increased to 328 at the 2011 census. The church town is on the east bank of the River Fowey south of Lostwithiel. Part of the village of Lerryn lies within the parish as does the Chapel of St Nectan. The Redlake Meadows & Hoggs Moor, a Site of Special Scientific Interest is also in the parish.