Nancy Thompson is a fictional character in the A Nightmare on Elm Street franchise. She first appears in A Nightmare on Elm Street (1984) as a teenager hunted in her dreams by enigmatic serial killer Freddy Krueger. In this film, she was portrayed by Heather Langenkamp—who reprises the role in the sequel, A Nightmare on Elm Street 3: Dream Warriors (1987). Langenkamp later portrayed a fictional version of herself who embodies the role of Nancy in Wes Craven's New Nightmare (1994). A reimagined version of the character, Nancy Holbrook, is portrayed by Rooney Mara in the 2010 remake.

A Nightmare on Elm Street is a 1984 American supernatural slasher film written and directed by Wes Craven and produced by Robert Shaye. It is the first installment in the A Nightmare on Elm Street franchise and stars Heather Langenkamp, John Saxon, Ronee Blakley, Robert Englund as Freddy Krueger, and Johnny Depp in his film debut. The film's plot concerns a group of teenagers who are targeted by Krueger, an undead child killer who can murder people through their dreams, as retribution against their parents who burned him alive.