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 Harry Potter and the Order of the Phoenix.