Jeffrey DeMunn (born April 25, 1947) is an American actor of stage, film, and television. He is known as a favorite actor of director Frank Darabont, who cast him in all four of his films: The Green Mile, The Shawshank Redemption, The Majestic, and The Mist (he also appeared in the 1988 remake of The Blob, which Darabont co-wrote). He also has an extensive television filmography: he has appeared in series such as Kojak, Law & Order, and two of its spin-offs — Special Victims Unit and Trial by Jury.

He has participated in adaptations of Stephen King's works more than any other actor. He has appeared in the adaptations of Rita Hayworth and Shawshank Redemption, The Green Mile, The Mist, and the television miniseries Storm of the Century. He has also narrated the audiobooks Dreamcatcher and Colorado Kid.

In 1995 he received a CableACE Award for Best Supporting Actor in a Movie or Miniseries for his role as serial killer Andrei Chikatilo in the HBO film Citizen X.