Knight Crusader, "the story of Philip d'Aubigny", is a children's historical novel by Ronald Welch (Ronald Oliver Fenton), first published by Oxford in 1954 with illustrations by William Stobbs. It is set primarily in the Crusader states of Outremer in the twelfth century and features the Battle of Hattin and the Third Crusade. Welch won the annual Carnegie Medal from the Library Association, recognising the year's best children's book by a British subject.