Julius Classicus was a Gaulish nobleman and military commander of the 1st century AD, belonging to the tribe of the Treviri. He served as a commander of the Roman auxiliaries. Along with Julius Tutor, another Treviran Roman auxiliary commander, and Julius Sabinus, who claimed descent from Gaius Julius Caesar, he joined the rebellion of Gaius Julius Civilis during the disorder of the Year of the Four Emperors (69 AD).