Legio VI Herculia: one of the legions of the later Roman empire. Its name means "the legion dedicated to Hercules".
Together with IIII Flavia Felix (in Singidunum) and V Iovia, VI Herculia protected the important city Sirmium (Sremska Mitrovica). Several rooftiles attest to its presence at Teutoburgium (near modern Vukovar). Together, V Iovia and VI Herculia were the garrison of the newly created province of Pannonia Secunda.