Must Farm is a Bronze Age archaeological site consisting of five houses raised on stilts above a river built around 950 BC in Cambridgeshire, England. The settlement is exceptionally well preserved because of its sudden destruction by catastrophic fire and subsequent collapse onto oxygen-depleted river silts.

The site is on the bed of a now-defunct river in Flag Fen basin, a 46,000 km² area of wetland which was formed at the last glacial maximum.

The site has been described as "Britain's Pompeii" because of its condition and was named Best Archaeological Project and Best Archaeological Discovery at the 2012 British Archaeological Awards, and Best Discovery at the 2016 Awards. An article describing the settlement won the 2020 Antiquity Prize.

Wooden posts were first recognised at the site in 1999, leading to preliminary excavations in 2004 and 2006. Early finds at the site include a rapier and a sword in 1969. Between 2011 and 2012, eight Bronze Age log boats were discovered. The boats were found in a small freshwater palaeochannel and were preserved because of waterlogging.

Radiocarbon dating has indicated that the ages of these boats spanned a period of about 1,000 years, with the earliest examples dating to around 1750–1650 BC. Some of the boats may have been deliberately sunk. They are now preserved at Flag Fen and are available to view on guided tours.

Bronze Age woven wooden fish traps and wattle-hurdle fish weirs were found in the same channel, together with metalwork including swords and spears.

In September 2015, the University of Cambridge's Cambridge Archaeological Unit began a dig, eventually covering 1,100 square metres (1,300 sq yd), the details of which were publicly disclosed in January 2016.

Topsoil was removed to expose the prehistoric land that was built upon. The site was excavated using GPS in order to create contour and survey maps once the dig concluded. All artefacts found were mapped with GPS and recorded using a written record.