Halliggye Fogou is one of many fogous in Cornwall, England, United Kingdom. Located in Trelowarren estate, near Helston, it consists of a long narrow tunnel leading to three sectioned chambers, and a window-like entrance which was dug in Victorian times by supposed treasure hunters (this has recently been filled in). It is one of the finest examples of a fogou in the UK. It was described by Sir Richard Vyvyan in his "Account of the ‘fogou’ or cave at Halligey, Trelowarren", in the Journal of the Royal Institution of Cornwall (1885, viii. 256-58) and was excavated in 1982 after routine ploughing of the field, when the blade of the plough breached the roof of the main chamber: this hole has since been turned into an entrance stairway for visitors.