thumb|Altar to Belatocadrus from [[Kirkbride, Cumbria. It is inscribed .|alt=A black and white drawing of a stone block with a Latin inscription.]]
Belatucadros or Belatucadrus, was a deity worshipped in Celtic northern Britain, particularly in Cumberland and Westmorland. In the Roman period he was identified with Mars and appears to have been worshipped by lower-ranked Roman soldiers as well as by Britons. In five inscriptions he is called Mars Belatucadrus and the name is frequently translated as "fair shining one" or "fair slayer."
Belatucadros is known from approximately 28 inscriptions in the vicinity of Hadrian's Wall. Dedications to Balatocadrus, Balatucadrus, Balaticaurus, Balatucairus, Baliticaurus, Belatucairus, Belatugagus, Belleticaurus, Blatucadrus and Blatucairus are generally accepted as variants of the most common of these forms: Belatucadrus.