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Updated on Jan 17, 2020. Posted on Jan 13, 2020

Here Are All The Super Famous People We Forgot Were In "Harry Potter"

Gobsmacked that Det. Gordon from Batman Begins is also SIRIUS BLACK!

1. Emma Thompson as Sybill Trelawney

Tim P. Whitby / Getty Images, Warner Bros.

Where you know her from: Late Night, Last Christmas, and Nanny McPhee.

Fun fact: She also starred in Love Actually with fellow Harry Potter costar Alan Rickman.

2. John Cleese as Nearly Headless Nick

Stephen Lovekin / Getty Images, Warner Bros.

Where you know him from: Monty Python, Shrek, and A Fish Called Wanda.

3. Kenneth Branagh as Gilderoy Lockhart

John Phillips / Getty Images, Warner Bros.

Where you know him from: Murder on the Orient Express, Dunkirk, and Hamlet.

Fun fact: He was married to fellow Harry Potter costar Emma Thompson from 1989–1995.

4. Gary Oldman as Sirius Black

Daniel Leal-olivas / Getty Images, Warner Bros.

Where you know him from: The Dark Knight Trilogy, Darkest Hour, and Tinker Tailor Soldier Spy.

5. Ralph Fiennes as Lord Voldemort

John Phillips, Warner Bros.

Where you know him from: Maid In Manhattan, Grand Budapest Hotel, and Skyfall.

Fun Fact: He's costarring in Dolittle with fellow Harry Potter alumna, Emma Thompson.

6. David Tennant as Barty Crouch Jr.

Frazer Harrison / Getty Images, Warner Bros.

Where you know him from: Doctor Who, Broadchurch, and Jessica Jones.

7. Robert Pattinson as Cedric Diggory

David Livingston / Getty Images, Warner Bros.

Where you know him from: The Twilight Saga, The King, and The Lighthouse.

Fun Fact: He's starring in Tenet with Harry Potter alums Kenneth Branagh and Clémence Poésy (Fleur Delacour).

8. Helena Bonham Carter as Bellatrix Lestrange

Pascal Le Segretain / Getty Images, Warner Bros.

Where you know her from: The Crown, Fight Club, and Les Miserables.

Fun Fact: She used to date Harry Potter alum Kenneth Branagh from 1994–1999.

9. Rhys Ifans as Xenophilius Lovegood

Jeff Spicer / Getty Images, Warner Bros.

Where you know him from: Notting Hill, The Amazing Spider-Man, and Snowden.

10. Bill Nighy as Rufus Scrimgeour

Frazer Harrison / Getty Images, Warner Bros.

Where you know him from: The Best Exotic Marigold Hotel, Detective Pikachu, and About Time.

Fun Fact: He's one of the many Harry Potter alums that also starred in Love Actually.

11. Verne Troyer as Griphook

Ethan Miller / Getty Images, Warner Bros.

Where you know him from: Austin Powers and Fear and Loathing in Las Vegas.

12. Alfred Enoch as Dean Thomas

Leon Bennett / Getty Images, Warner Bros.

Where you know him from: Sherlock and How To Get Away With Murder.

Fun Fact: In all eight Harry Potter films, Alfred has less than eight lines. He spoke more in the pilot of HTGAWM than the entirety of Harry Potter.

13. Hero Fiennes-Tiffin as Young Tom Riddle

Jon Kopaloff / Getty Images, Warner Bros.

Where you know him from: After series.

Fun fact: He is the nephew of Ralph Fiennes, who played Voldemort as an adult.

14. Domhnall Gleeson as Bill Weasley

Tristan Fewings / Getty Images, Warner Bros.

Where you know him from: Star Wars, Ex Machina, and The Revenant.

Fun Fact: He starred alongside Harry Potter alum Bill Nighy in About Time.

15. Natalia Tena as Nymphadora Tonks

Frederick M. Brown / Getty Images, Warner Bros.

Where you know her from: Game of Thrones, About A Boy, and Black Mirror.

16. Freddie Stroma as Cormac McLaggen

Angela Weiss / Getty Images, Warner Bros.

Where you know him from: Unreal, Pitch Perfect, and 13 Hours.

Fun Fact: He appeared in Game of Thrones along with fellow Harry Potter alumna Natalia Tena.