When HARLIE Was One is a 1972 science fiction novel by David Gerrold. It was nominated for the Nebula Award for Best Novel in 1972 and the Hugo Award for Best Novel in 1973. The novel, a "fix-up" of previously published short stories, was published as an original paperback by Ballantine Books in 1972, with an accompanying Science Fiction Book Club release. A revised version, subtitled "Release 2.0", was published in 1988 by Bantam Books.