Stithians (Cornish: Stedhyans), also known as St Stythians, is a village and civil parish in Cornwall, England, United Kingdom. It lies in the middle of the triangle bounded by Redruth, Helston and Falmouth. Its population (2001) is 2,004, increasing to 2,121 at the 2011 census An electoral ward in the same name also exists but stretches north to St Day. The population here also at the 2011 census was 5,023.
The parish is mainly agricultural, lying south of the Gwennap mining area and north of the quarrying areas of Rame and Longdowns. The River Kennall runs through the parish: in the 19th century, this river worked a flour mill and a number of gunpowder mills, machinery at a foundry, and a paper mill.
The parish church is dedicated to St Stythian, but it is hard to identify this saint. References to the parish in 13th and 14th century records show various spellings: Stethyana, Stediana, Stedyan, Stediane, and Stidianus. Rev Sabine Baring-Gould's "Cornish Dedications" (1906) makes a connection with St Etaine of Tumna in Ireland, while Rev Michael Warner (Vicar of Stithians 1983-1993) suggests St Stephen . The saint's feast day is the Sunday nearest 10 July, and Stithians Show is held on the Monday following Feast Sunday.