Detective Inspector William Edward "Jack" Frost, GC QPM, is a fictional detective created by R. D. Wingfield—characterised as sloppy, untidy, hopeless with paperwork—but unmatched at solving mysteries. The character has appeared in two radio plays, ten published novels, and a TV series spanning 42 episodes between 1992 and 2010. "Jack" is a nickname, alluding to Jack Frost.