Hariulf
Hariulf or Hariulfus may refer to:
- Hariulfus (Burgundian prince) (fl. 4th century)
 - Hariulf or Ariulf of Spoleto (died 602), duke
 - Hariulfus or Herulph (died 815), founder of Ellwangen Abbey
 - Hariulf of Oudenburg (died 1143), abbot and historian