St Breock (Cornish: Nanssans) is a village and a civil parish in north Cornwall, England, United Kingdom.

St Breock village is 1 mile (1.6 km) west of Wadebridge immediately to the south of the Royal Cornwall Showground.

It was granted to the Bishops of Sherborne by King Egbert of Wessex and held by their successors until it was alienated under Henry VIII.

At Nanscowe Farm a pillar stone of the 5th or 6th century with inscription meaning 'To the son of Ulcagnus; and to Severus' (in Latin).

[6][7] The parish church grid reference SW 977 717 is dedicated to St Briocus and dates back to the 13th century although it was extensively rebuilt in 1677.

The nave is longer than usual in a parish church: this may be connected to the fact that the Bishops of Exeter owned the manor of Pawton before the Reformation and had a palace there.