16 actors you probably didn't realize were in the 'Harry Potter' movies

divination ron harry and hermione
We're so over these three. Warner Bros

When it comes to "Harry Potter," everybody knows the film's leading trifecta: Daniel Radcliffe, Rupert Grint, and Emma Watson. 

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But what about the dozens of other witches, wizards, and muggles who graced the screen throughout the series? While you were watching Harry and his friends fight dragons and hunt horcruxes, these performances from veteran actors and youngsters just beginning their careers might have totally passed you by.

From cameo appearances from the cast of "Dancing with the Stars" to a member of the band Radiohead, here are 16 actors you might have missed in "Harry Potter":

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Alfred Enoch has come a long way since his days playing Dean Thomas in "Harry Potter." Today, you can spot him as law student Wes Gibbins on "How to Get Away with Murder."

Alfre Enoch Harry Potter
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Scarlett Byrne kept company with fellow Slytherin Draco Malfoy as the sour Pansy Parkinson. Today, she's starring in a different magical world as Nora Hildegard on "The Vampire Diaries."

Scarlett Byrne
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Verne Troyer was the first of two actors to play Griphook the goblin in "Harry Potter," but you probably recognize him from his most famous role as Mini-Me in "Austin Powers."

Verne Troyer
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John Cleese haunted the Hogwarts halls as Nearly Headless Nick. Cleese is better known for his sketch-comedy work in "Monty Python."

John Cleese
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In "Harry Potter," Luke Youngblood palled around with Harry and their fellow Gryffindors. "Community" fans will recognize Youngblood from his role as Magnitude.

Luke Youngblood
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Frank Dillane played a menacing Tom Riddle, the boy would become the evil Lord Voldemort. Now, he's starring as Nick Clark on "Fear the Walking Dead."

Frank Dillane
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Julianne Hough had a cameo appearance as an unnamed Gryffindor in "Harry Potter and the Sorcerer's Stone." She went on to a successful TV career on "Dancing with the Stars" and recently scored the role of Sandy in "Grease Live!"

JUlianne Hough
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Derek Hough also had a cameo, playing a Ravenclaw student holding an owl and heading home for Christmas in "Harry Potter and the Sorcerer's Stone." Like his sister, Hough went on to compete on "Dancing with the Stars."

Dereke Hough
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You might remember Domhnall Gleeson, and his flaming red hair, as Ron Weasley's oldest brother, Bill. More recently, Gleeson played General Hux in "Star Wars: The Force Awakens."

Domhnall Gleeson
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Freddie Stroma drove his Hogwarts classmates nuts as the pompous Cormac McLaggen. In 2012, Stroma showed off his singing chops as Luke in "Pitch Perfect."

Freddie Stroma
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Michelle Fairley had a small appearance as Hermione Granger's mother in "Harry Potter and the Deathly Hallows." Now you'll find her playing loyal matriarch Catelyn Stark on "Game of Thrones."

Michelle Farley
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Natalia Tena fell in love with a werewolf playing the auror Nymphadora Tonks. These days, she's also a member of the "Game of Thrones" cast, starring as Osha.

Tonks before and after
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Warwick Davis actually had two different roles in "Harry Potter," Griphook the goblin and Professor Flitwick. In 2016, he played the interstellar scout Wollivan in "Star Wars: The Force Awakens."

Warwick Davies
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Johnny Greenwood was the lead guitarist of Weird Sisters, the band that rocked out on stage at the Yule Ball in "Harry Potter and the Goblet of Fire." In real life, Greenwood is a member of the band Radiohead.

Johhny Goodman
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David Tennant snarled as Barty Crouch Jr. in "Harry Potter." Outside of the wizarding world, he's made a name for himself on shows like "Doctor Who" and "Jessica Jones."

David Tennat
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Fiona Shaw shoved Harry in the cupboard under the stairs as Petunia Dursley. In 2011, she had a recurring role on HBO's "True Blood."

Fiona Shaw
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