St Winnow (Cornish: Sen Gwynnek[2]) is a civil parish in Cornwall, England, United Kingdom.

The Redlake Meadows & Hoggs Moor, a Site of Special Scientific Interest is also in the parish.

In 1644–45, some ninety people from the parish died of the plague: only four were soldiers but a campaign of the Civil War was going on at the time.

A cross found at Higher Coombe in 1903 was afterwards erected at St Nectan's chapel.

A stone church was built in the 12th century, probably cruciform in plan, and there are traces of the Norman stonework on the north side.

The 16th century rood screen, carved with leaves and flowers, was restored by Violet Pinwell in 1907 (by Edmund H. Sedding according to Pevsner).

The loft, rood and some of the south aisle screen were newly made in the restoration.

A burial plot with Celtic-style headstones for the Vivian family occupies the north-west corner of the churchyard.