Valerian may mean:
- Valerian (herb), a medicinal plant
- Valerian I, Roman emperor 253-260
- Valerian II, son of Gallienus (d. 258)
- St. Valerian, bishop of Abbenza (d. 457)
- St. Valerian, husband of Saint Cecilia
- Valérian and Laureline, French comics characters
- Valerian (child-martyr), saint of the Eastern Orthodox Church
- Valerian, a pseudonym used by Gary Numan