Catus Decianus was the procurator of Roman Britain in 61 AD. Tacitus blames his "rapacity" in part for provoking the rebellion of Boudicca.

When Boudicca's army attacked Camulodunum (Colchester), the inhabitants sent to the procurator for help, but he sent only two hundred men. The city fell, and Decianus fled to Gaul, to be replaced by Gaius Julius Alpinus Classicianus.