The Cohors IV Baetica was a cohort of Roman auxiliaries. It was originally recruited from natives of Hispania Baetica, a Roman province created on 29 BC, after the division of province Hispania Ulterior. In a bronze inscription dated 51–74 AD, which was found in Bergamo on 1871, it is mentioned a member of the cohors "M(arcus) Sempronius Fuscus praefectus cohortis Baeticae".