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Each Harry Potter fan probably remembers the main characters like Daniel Radcliffe, Emma Watson, and Tom Felton. However, when it comes to the other faces, your memory might be very cloudy. Here, we've collected 21 people that even the most devoted Harry Potter fan completely forgot they were in Harry Potter movies!
Christian Coulson appeared as the young Lord Voldemort Tom Marvolo Riddle in Harry Potter and the Chamber of Secrets (2002). Then he landed his role in Gossip Girl in 2010 and Nurse Jackie in 2013.
This French actress landed a role in three of Harry Potter movies as Fleur Delacour, who originally appeared as Beauxbatons' champion in the Triwizard Tournament and then went on to marry Bill Weasley. You might recognize her from Gossip Girl, where she played Eva Coupeau.
Frank Dillane creeps everyone out as the teenage Voldemort, Tom Riddle, aged 16, in Harry Potter and the Half-Blood Prince (2009). Fun fact: His dad is Stephen Dillane, a.k.a. Stannis Baratheon on Game of Thrones.
Michelle Fairley played Hermione's mother Mrs. Granger in Harry Potter and the Deathly Hallows: Part 1 (2010). But more notably, she portrayed Catelyn Stark on Game of Thrones.
Freddie Stroma joined the cast of Harry Potter in three films, where he played Cormac McLaggen. Fun plot: Hermione takes Cormac as her date to Professor Slughorn's Christmas party, but he kept bragging about himself for the entire night.
In the H.P. movies, Alfred Enoch played Dean Thomas, who is one of Harry's extended friends in Gryffindor and a full-time chaser on the house Quidditch team.
Verne Troyer made an appearance in Harry Potter and the Sorcerer's Stone, portraying Griphook the Goblin, who betrayed Harry Potter and was finally killed by Lord Voldemort.
John Cleese shot two Harry Potter films as Nearly Headless Nick, a ghost of Gryffindor Tower, who is always happy to guide lost house members to class and other places around Hogwarts.
Fiona Shaw made her appearance in five Harry Potter movies as Aunt Petunia Dursley. She also starred in True Blood as Marnie Stonebrook.
Luke Youngblood starred in the first two Harry Potter movies and went on to play Magnitude on Community and Sid on Galavant.
Julianne Hough just portrayed an uncredited Hogwarts student in Harry Potter and the Sorcerer's Stone (2001). She was in Gryffindor and had an enormous crush on Daniel Radcliffe.
Shirley Henderson landed the role of Moaning Myrtle that haunting the u-bend of the first-floor girls' bathroom at Hogwarts in Harry Potter and the Chamber of Secrets (2002).
Julie Christie played Madam Rosmerta, the landlady of the Three Broomsticks pub in Hogsmeade in Harry Potter and the Prisoner of Azkaban (2004).
Ian Brown got a simple shot as an uncredited patron reading A Brief History of Time in the Leaky Cauldron in Harry Potter and the Prisoner of Azkaban (2004).
You may know Robert Pattinson from Twilight. But he also made an appearance in two Harry Potter movies, portraying Cedric Diggory, the heroic Hufflepuff Quidditch team Seeker, who meets his demise at Lord Voldemort's orders.
Jarvis Cocker made a short appearance as a singer in the Yule Ball band in Harry Potter and the Goblet of Fire (2005). In reality, Cocker is the frontman of Pulp.
Natalia Tena played Nymphadora Tonks in four of Harry Potter movies. But you may know her as wildling Osha on Game of Thrones.
Scarlett Byrne landed a role as Slytherin member Pansy Parkinson, who turns her back on Harry Potter several times at Hogwarts and dates Draco Malfoy. Byrne later starred in The Vampire Diaries as Nora Hildegard.
Bill Nighy appeared in Harry Potter and the Deathly Hallows: Part 1 (2010) as Minister Rufus Scrimgeour, who meets his demise at the hands of Lord Voldemort during the Second Wizarding War.
Domhnall Gleeson appeared in two Harry Potter movies as Bill Weasley and his father Brendan Gleeson too as Mad-Eye Moody. Lately, Gleeson's career begins exploding.
Kelly Macdonald played the ghost Helena Ravenclaw in Harry Potter and the Deathly Hallows: Part 2 (2011), the final installment of the H.P. saga.