Richard Deacon may refer to:
- Donald McCormick (1911–1998), British writer who also used the pseudonym Richard Deacon
- Richard Deacon (actor) (1921–1984), American actor
- Richard Deacon (sculptor) (born 1949), British sculptor
- Dickie Deacon (1911–1986), Scottish footballer
- Richard Deacon, a Marvel Comics character also known as The Fly