Boudica ( /ˈbuːdɨkə/; alternative spelling: Boudicca), also known as Boadicea /boʊdɨˈsiːə/ and known in Welsh as Buddug [ˈbɨ̞ðɨ̞ɡ] (d. AD 60 or 61) was queen of the British Iceni tribe who led an uprising against the occupying forces of the Roman Empire.

Boudica's husband Prasutagus, ruler of the Iceni tribe who had ruled as a nominally independent ally of Rome, left his kingdom jointly to his daughters and the Roman Emperor in his will. However, when he died, his will was ignored — the kingdom was annexed as if conquered, Boudica was flogged, her daughters were raped, and Roman financiers called in their loans.

In AD 60 or 61, while the Roman governor, Gaius Suetonius Paulinus, was leading a campaign on the island of Anglesey in northern Wales, Boudica led the Iceni people, along with the Trinovantes and others, in revolt. They destroyed Camulodunum (modern Colchester), formerly the capital of the Trinovantes, but now a colonia (a settlement for discharged Roman soldiers) and the site of a temple to the former emperor Claudius, which was built and maintained at local expense. They also routed a Roman legion, the IX Hispana, sent to relieve the settlement.