Giants Unleashed is an anthology of science fiction short stories edited by Groff Conklin. It was first published in hardcover by Grosset & Dunlap in 1965. A paperback edition followed from the publisher's Tempo Books imprint in April 1966, and was reprinted (under the alternate title Minds Unleashed in October 1970. The book collects twelve novelettes and short stories by various science fiction authors, together with an introduction by the editor. The stories were previously published from 1939-1958 in various science fiction and other magazines.