Julius Indus was a nobleman of the Gaulish Treveri tribe. In 21 AD he helped the Romans put down a rebellion of the Treveri and Aedui. He went on to lead the Ala Gallorum Indiana cavalry unit which may have been involved in the Roman invasion of Britain, and was certainly posted at Corinum (Cirencester) in the mid-to-late 1st century.

His daughter, Julia Pacata, married the procurator of Roman Britain, Gaius Julius Alpinus Classicianus, and buried him in London in 65.