Landewednack (Cornish: Lanndewydnek (hamlet) or Pluw Wydnek (parish)) is a civil parish and an area of The Lizard in Cornwall, England, United Kingdom.

The hamlet is situated approximately ten miles (16 km) south of Helston.

[2] The parish church, dedicated to St Winwallow, is the most southerly in England and is built of local serpentine stone (see St Wynwallow's Church, Landewednack).

Caerthillian cove and beach sits on the western border of the parish.

Landewednack is twinned with Landévennec (Breton: Landevenneg) in Brittany, France.