Helios was a science fiction fanzine by Sam Moskowitz.
The first issue of Helios was published in June 1937 in Newark, New Jersey, U.S.A., edited by Sam Moskowitz and Alex Osheroff. It was a hectographed, stapled publication. Six issues were released, with issues two to six edited solely by Moskowitz. The last issue appeared in May 1938.
Contributors included Robert Sanders Shaw (a pseudonym for Moskowitz), Willis C. Conover (Science-Fantasy Correspondent), Morris Scott Dollens (Science-Fiction Collector), Litterio B. Farcasi (The Golden Atom), John Russell Fearn, Chester Fein, Nils Helmer Frome (Supramundane Stories), Jack Gillespie, David H. Keller, Fred Lawrence, Daniel McPhail (Phantasy Press, The Rocket), Dan Montone, John Bee Myshell, Alex Osheroff, J. Michael Rosenblum (Futurian War Digest), Wilson Shepherd, Clark Ashton Smith, Louis C. Smith, Corwin Stickney (Amateur Correspondent), William Sykora, James V. Taurasi (Cosmic Tales), Robert G. Thompson, Raymond Van Houten (Tesseract), Richard Wilson, Jr., and Donald Wollheim (The Phantagraph).
Contributors of art work included Morris Scott Dollens, among others.