Who (pronoun)'s an English language interrogative pronoun. In fiction Who? (novel), a 1958 novel by science fiction author Algis Budrys, turned into a film with the same title in 1973 Doctor Who, a British science fiction television series The first baseman in the Abbott and Costello routine "Who's on First?" W.H.O., a fictional computer in the Marvel comics universe The "Whos" of Whoville, a creature featured in the Dr. Seuss books Horton Hears a Who! and In music "Who", a song by Ky… (More on Who)