Alex could refer to:
- Alex Crockford: the actor who porteyed Charlie Weasley in the film adaptation of Harry Potter and the Prisoner of Azkaban.
- Alex Palmer: the actor who portrayed Avery in the film adaptation 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 video game version of Harry Potter and the Order of the Phoenix.