Marianne Chase is a British actress who played Rionach O'Neal in the third film and a member of the kissing couple in the fifth film. Chase also played a Gryffindor student in the fourth, sixth, and Part 1 and 2 of the seventh film.
- Harry Potter and the Prisoner of Azkaban (film)
- Harry Potter and the Goblet of Fire (film)
- Harry Potter and the Order of the Phoenix (film)
- Harry Potter and the Half-Blood Prince (film)
- Harry Potter and the Deathly Hallows: Part 1
- Harry Potter and the Deathly Hallows: Part 2