Dean Thomas is a fictional character from the Harry Potter books. He is a black boy who is taller than Ron and was sorted into Gryffindor house; he is good at drawing and forging signatures. He comes from a Muggle family, which is evidenced by him being a fan of the soccer team West Ham and using the word "cool" a lot. He's the best friend of Seamus Finnigan, but unlike Seamus, he believed Harry's claim of Voldemort returning during their fifth year at Hogwarts.

Dean was one of the members of the D.A, and considers Parvati and Padma Patil to be the best looking girls in their year.