Prospidnick is a small village and hill in the parish of Sithney in Cornwall, United Kingdom.

[5] Historically, it was known for its granite hills; and the Propidnick Wheal Mine and quarry operated in the area.

[13] Much of Longstone Downs was turned into tillable ground in the early 1880s by Mr R G Rowe who had a 99-year lease on the higher portion of Prospidnick Hill.

Some of the surrounding area was not suitable for crops, Mr Bickford-Smith planted several acres of shrubs ″ ... which, it is hoped, will in a few years tend to relieve the monotony of the present appearance of the long stretch of the Prospidnick Hills.″[14] Prospidnick Manor once belonged to the Arundells, then Christopher Wallis and in 1872 was reported to be in the property of his representative C W Popham.

[15] The Prospidnick Long Stone is a 3 metres (9.8 ft) high standing stone, a large granite menhir, on Longstone Down, 660 metres (2,170 ft) northeast of Prospidnick Hill.