The Ordovices were one of the Celtic tribes living in Great Britain, before the Roman invasion of Britain. Its tribal lands were located in present day Wales and England between the Silures to the south and the Deceangli to the north-east. The Ordovices were conquered by the Roman governor Gnaeus Julius Agricola in the campaign of AD 77/78.

The Celtic name ordo-wik- could have a meaning in some way related to the word for "hammer"; Irish 'Ord', Welsh 'Gordd' (with a G- prothetic) and Breton 'Horzh' (with a H- prothetic), all of which mean "hammer."

The Ordovices farmed and kept sheep and built fortified strongholds and hillforts. They were among the few British tribes that resisted the Roman invasion. The resistance was mainly organized by the Celtic leader Caratacus, exiled in their lands after the defeat of his tribe in the Battle of the Medway. Caratacus became the warlord of the Ordovices and neighbouring Silures, and a Roman public enemy in the decade of 50. Following the Battle of Caer Caradoc, where governor Publius Ostorius Scapula defeated Caratacus, the Ordovices stopped being a threat to Rome, probably due to heavy losses.