Vithicabius (German: Vithicab) was an Alemannic petty king from 360 to 368.
He was a son of Vadomarius, and succeeded his father as king after the latter had been banished to Hispania by emperor Julian.
Ammianus Marcellinus describes Vithicabius as a physically weak, but a brave and aggressive leader.
Although having promised Julian to maintain peace, Vithicabius continued raiding Roman territory.
He was assassinated in 368 under Valentinian I by a bribed servant, but the Alemannic raids on Roman territory continued nevertheless.