C. J. or CJ Allen may refer to:
C. J. Allen (sculptor) (1862–1956), British sculptor Cecil J. Allen (1886–1973), British railway engineer and writer C. J. Allen (actor) (fl. 1982–2006), British actor CJ Allen (hurdler) (born 1995), American track and field competitor CJ Allen (American football) (born 2005), American football player