Ib Jørgen Melchior (born September 17, 1917) is a novelist, short story writer, film producer, film director, and screenwriter of low-budget American science fiction movies, most of them released by American International Pictures. He was born in Copenhagen, Denmark.

Melchior's novels include Code Name: Grand Guignol, Eva, The Haigerloch Project, The Marcus Device, Order of Battle: Hitler's Werewolves, Sleeper Agent, The Tombstone Cipher and The Watchdogs of Abaddon.