Quentin is a given name that can refer to:
- Quentin Kowalski, American Quidditch player
- Quentin Trimble, a former Headmaster whose portrait hangs at Hogwarts
Quentin is a surname that can refer to:
- Hayley Quentin, a Slytherin student
Quentin is the English form of the name Quintinus meaning "fifth born" or "fifth son". Quintinus, in turn, is the diminutive form of the Latin quintus meaning "fifth". Quintus, in turn, comes from the Latin quinque meaning "five"  . See Quintius (disambiguation) for more information.
Decide whether Quintin Black goes with Quentin or Quintius.