Sithney (Cornish: Merthersydhni)[1] is a village and civil parish in the West of Cornwall, England, United Kingdom.

In 1230 the church belonged to the Antrenon family who attached to it a charge of 4 shillings yearly to the priory of St Germans.

[9] At St Johns near Helston Bridge a hospital was founded c. 1250 by Henry de Bollegh, Archdeacon of Cornwall, and endowed with the manor of Penventon by the Reskymer family.

The hospital was abolished in 1545; by this time the priors had been non-resident for 50 years, the building was ruinous and a lone chaplain served the chapel.

A leper hospital was founded nearby in the 15th century and dedicated to St Mary Magdalene.

[12] The gate piers, courtyard, walls and central building linking the old mansion and Truthall manor are Grade II* listed.

), originally from Sithney,[21] won many tournaments in the UK before emigrating to Australia, including beating Gundry in Penzance in 1843.

[22] He was an Australian Cornish wrestling champion in the late 1840s and early 1850s, winning over 80 prizes.

[26] He was owner of the Brecknock Arms in Adelaide which was the venue for many tournaments and challenge matches.