YHOS (acromyn for Your Humble Obiedient Servant) is a long-running fanzine published by California-based Art Widner.
It is a science fiction zine that is largely distributed through the Fantasy Amateur Press Association.
It was first published from 1940 till 1045, when the first thirteen issues were produced. Art Widner is well known for the very long break he took from fanzines, but upon his return to activity in 1979 he resumed publication of YHOS till 2001, and issues 14 to 58 were released.
Contributors have included illustrators Harry Turner (Zenith) and Taral Wayne (DNQ).