- Christopher John Francis Boone
- The protagonist and narrator of the novel who has many behavioural issues and who investigates the murder of Mrs. Shears's dog Wellington.
- Ed Boone
- Christopher's father, a boiler engineer and single parent. When the story begins, Christopher has been living with Ed for two years.
- Judy Boone
- Christopher's mother. Early in the book, Christopher writes that she died of a heart attack two years before the book's events.
- Toby
- Christopher's pet rat who dies at the end of the book.
- Wellington
- Mrs. Shears's large black Poodle, found dead in the night-time, speared with a garden fork.
- Siobhan
- Christopher's paraprofessional and mentor at school. She teaches him how society works and how to behave within its complex guidelines.
- Eileen Shears
- owner of the dog Wellington; she consoled Ed and Christopher for a time after Christopher learns of his mother's death.
- Roger Shears
- Mrs. Shears's ex-husband and Judy Boone's lover.
- Mrs. Alexander
- an elderly neighbour who offers information to help Christopher's investigation regarding his parents and Mr. and Mrs. Shears.
- Mr. Jeavons
- Christopher's psychologist.
- Rhodri
- Ed Boone's employee.
- Sandy
- Christopher's Golden Retriever puppy that his dad buys for him at the end of the book to rebuild their relationship.
- Reverend Peters
- the invigilator at Christopher's math exam.
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