The Tower of Zanid is a science fiction novel by American writer L. Sprague de Camp, the sixth book of his Viagens Interplanetarias series and the fourth of its subseries of stories set on the fictional planet Krishna. Chronologically it is the seventh Krishna novel. It was first published in the magazine Science Fiction Stories for May 1958. It was first published in book form in hardcover by Avalon Books, also in 1958, and in paperback by in 1963. It has been reissued a number of times since by various publishers. For the later standard edition of Krishna novels it was published together with The Virgin of Zesh in the paperback collection The Virgin of Zesh & The Tower of Zanid by Ace Books in 1983. An E-book edition was published by Gollancz's SF Gateway imprint on September 29, 2011 a