Grade–Ruan is a civil parish on the Lizard peninsula in Cornwall, England, United Kingdom, approximately ten miles south of Falmouth.
It is a rural parish bounded to the east by St Keverne parish and by the sea; to the west by Mullion and Cury parishes; and to the south by Landewednack parish.
Grade–Ruan civil parish encompasses part of Goonhilly Downs and the major settlements are Ruan Minor, St Ruan and Cadgwith. The parish was formed in 1934 because falling population necessitated merging the ecclesiastical parishes of Grade, Ruan Major and Ruan Minor. All three were in the Deanery and Hundred of Kerrier. Formerly, Cadgwith was partly in Grade parish and partly in Ruan Minor parish.
The population of Grade–Ruan has increased steadily; it was 677 in 1961, 835 in 1981, 1070 in 2001, and 936 in 2011. There is a school in the parish, Grade Ruan CE Primary School, which is situated in Ruan Minor.
Grade–Ruan lies within the Cornwall Area of Outstanding Natural Beauty.
The parish churches of the three former parishes are St Grada at Grade, and the churches of Ruan Major and Ruan Minor, the latter two dedicated to St Rumonus.