The Cunetio Treasure, also known as the Mildenhall Treasure, is the largest Treasure of Roman coins found in Great Britain. It was discovered in 1978 at the site of the Roman town of Cunetio, near present-day Mildenhall, Wiltshire, and consisted of 54,951 coins of low denomination. The coins were in a large pot and lead container. The coins are now in the British Museum and the pot is on display at the Wiltshire Museum in Devizes.
Cunetio developed from a small settlement into an important economic market in the area, which is thought to explain the concentration of coins. Excavations of a nearby well in 1912 found 102 coins, possibly from another hoard. A smaller hoard was found at this site in 1960.
The 1978 hoard consisted of 54,951 coins weighing over 180 kilograms (390 pounds). Most of the coins were low value radiated, However there were a significant number of Antoniniani, some of which dated from the reign of Gallienus (253-268). The coins were dated between 250-275 AD, but most were from the independent empire established in Gaul by Postumus in 260. Large hoards of Roman coins were found at Misrata in Libya, and are believed to have been found at Evreux in France (100,000 coins) and Comin, Croatia (300,000 coins); but at the time of the discovery the Cunetio hoard was the largest in Britain.
The site of the hoard and the wider settlement were investigated and excavated for the television program Time Team on Channel 4 in 2009.