Alex could refer to:
- Alex Argenti: an Italian-born British actress who played the uncredited role of "Wizard" in the film version of Harry Potter and the Goblet of Fire.
- Alex Crockford: the actor who porteyed Charlie Weasley in the film version of Harry Potter and the Prisoner of Azkaban.
- Alex Howes: provided the voice for a Hufflepuff student in the Harry Potter and the Half-Blood Prince video game.
- Alex Palmer: the actor who portrayed Avery in the film version of Harry Potter and the Goblet of Fire.
- Alex Sykes: a Slytherin student at Hogwarts in the 1990's.
- Alex Tregear: the actress who voiced Susan Bones in the vide game version of Harry Potter and the Order of the Phoenix.