File 770 is a science fiction fanzine by Mike Glyer.
File 770 is published in Sierra Madre, California, U.S.A. The first issue appeared in January 1978, and has appeared regularly since then, with 160 issues published in that time.
Contributing artists include Harry Bell (Grimwab), Grant Canfield, John DeChancie, Kurt Erichsen, Brad Foster, Alexia Gilliland, Tim Marion, Ray Nelson, Marie Rengstorff, Bill Rotsler, Steve Stiles, ATom (The ATom Anthology), Taral Wayne (DNQ), Len Wein, and Alan White.
Contributing photographers include Kenn Bates, Diana Glyer, Mike Glyer, Francis Hamit, Ian Sorensen, Keith Stokes, Leigh Strother-Vien, John King Tarpainian.
File 770 has won the Hugo Award for Best Fanzine four times, for the years 1989, 2000, 2001 and 2008.