Guy Montag The protagonist, an unhappy, complacent man who is thirty years old. He has been a fireman for ten years. He meets Clarisse and finds that her outlook on life is refreshing.
Mildred Montag (Millie) Guy's self-destructive wife, also thirty years old, who reveals to Montag the alienated existence of citizens in his society. She has never wanted children and considers her family to be television characters.
Clarisse McClellan Montag's new neighbor, seventeen years old, who calls herself crazy and enjoys conversations. Her recalcitrance and nonconformity allow Montag to discover how jaded his view of life has become.
Captain Beatty The antagonist of the book and Montag's superior, the Fire Captain, who functions as the apologist for the dystopian culture in which Montag lives. He is well read and uses his knowledge of books as a weapon to fight curiosity about them.
Mechanical Hound A machine, similar to a trained killer dog that the firefighters use to track down and capture criminals. The Hound disables and kills offenders with a morphine or procaine needle.
Unidentified Woman A woman from the ancient part of the city. Her martyrdom reveals to Montag the power of civil disobedience, books, and ideas.
Faber An elderly man, a retired English professor who is an underground, though ineffectual, scholar. He becomes Montag's ally and mentor.
Granger An ex-writer who is the unacknowledged leader of the social outcasts and criminals. He unites the group to keep the content of books safe.
Stoneman and Black Montag's fellow firemen who are conformists, and conservatives. Together with Beatty, they form Montag's familiar working colleagues.
Mrs. Phelps and Mrs. Bowles Millie's friends who do not question the social structure. Their husbands are called away to war. They also view the television characters as their families and become agitated when Montag reads to them.
Fred Clement, Dr. Simmons, Professor West, Reverend Padover, and Harris in Youngstown Social outcasts and criminals who are led by Granger. They choose and memorize a book to ensure that the story is never forgotten.