Dirty Fred (or as Jimmy Ears refers to him: Dirty Alfred) is a comic character created by Hungarian author Jenő Rejtő (writing under the pseudonym P. Howard), and is the titular protagonist in several of Rejtő's most famous pulp novels.
Dirty Fred features (in order of writing) in the novels "The Lost Cruiser", "Dirty Fred, the Captain", "Dirty Fred intervenes (to Jimmy Ears' Sincere Regret)" and "The Found Cruiser". These novels have reached enormous popularity in Hungary after the author's death - including adaptations into radio dramas, plays, graphic novels and a board game - and Dirty Fred himself has become a well-known cultural touch stone, having had restaurants, songs and rock bands named after him.