John Deacon (disambiguation)
John Deacon (born 1951) is the former bassist of the rock band Queen.
John Deacon may also refer to:
- John Deacon (motorcyclist) (1962–2001)
 - John Deacon, wrongly convicted of arson, whose story was shown in Flashover (film)
 - John Deacon, former owner of English football club Portsmouth F.C.