Balfarg is a prehistoric monument complex, and an adjacent residential area, in Glenrothes in Fife, Scotland.
The Balfarg henge, located at grid reference NO282031, is part of a larger prehistoric ceremonial complex. It contains the remnants of a stone circle which has been partly reconstructed.
The Balfarg henge was excavated between 1977 and 1978 by Roger Mercer prior to the development of a new housing estate, work which established that the two extant standing stones were part of a circle that stood within the henge. The two surviving specimens lined the north-west oriented entrance to the henge.
Within the 64.9 metres (213 ft) diameter henge were found broken Neolithic pottery, burnt wood and bone which had been dumped on the site prior to the erection of a 25 metres (82 ft) wide timber circle of 16 wooden posts. Two especially large portal timbers stood on the west side of the circle. It is likely that the henge was built after these phases of activity. Grooved ware pottery found in the postholes dates to around 2900 BC. Some of the vessels may have been used to hold black henbane (Hyoscyamus niger) which is a poison but also a powerful hallucinogen.
Five further concentric post rings had also been erected outside and inside the main wooden circle although these were made from narrower timbers and may have supported hurdling or a palisade.
Later during the site's use the timber circle was replaced by two concentric stone circles, again with an entrance to the west and some time after this the henge was constructed. Around 1900 BC a pit was dug in the centre of the stone circles and in it was placed the body of a young man along with a flint knife and a handled beaker.