Ad Infinitum was a science fiction fanzine edited and published by Al Weinstein from New York, NY, U.S.A.
Five issues were published between May 1944 and July 1945.
The fourth issue (#1.4) (April 1945) featured fiction by Thomas Maloney; poetry by James Russell Gray; articles by Joe Kennedy (Vampire), Harry Warner, Jr. (Horizons), Bob Tucker (Le Zombie, Science Fiction Newsletter), Jay Chidsey, and Al Weinstein; art by Joy Kennedy, Tom Paley and Arthur McCourt. Letters came from Joe Kennedy, Gerry de la Ree (Sun Spots, Beowulf, Loki), Harry Warner, Jr., and others.
The fifth issue (#2.1) (July 1945) contained poetry by James Russell Gray, Sam Mason, Jay Chidsey, and Al Weinstein; articles by Bob Tucker, Joe Kennedy, Henry Elsner (The Scientifictionist), Sam Mason, Walt Dunkelberger (The National Fantasy Fan), Dave Caplan, Tom Paley, Jay Chidsey, and Al Weinstein; art by Jerry Waible, Tom Paley, Art McCourt, and Al Weinstein; and more.