Lansallos (Latin: Lansalux; Cornish: Lansalwys, meaning St Salwys' church[1]) is a village in the civil parish of Polperro in south Cornwall, England, United Kingdom.

It is situated between Polruan and Polperro about 5 miles (8 km) east of Fowey in Liskeard Registration District.

Lansallos forms an ecclesiastical parish, including the hamlets of Landaviddy and Raphael, and lies on the South West Coast Path near Polperro.

The chronicler William Worcester, when visiting Fowey, recorded that the church contained the remains of St Hyldren, reputedly a bishop; however documentary evidence indicates that the parish patron saint was female.

A rare contemporary slate memorial tablet survives commemorating Margaret Smith (died 1579), the work of the stonemason, Peter Crocker.