Cthulhu Cultus was a fanzine published by P. and T. Marsh and James Ambuehl.
Cthulhu Cultus was published in Florida, U.S.A. The first issue appeared in 1995. It was devoted to weird, supernatural and horror fiction and poetry with an emphasis on H. P. Lovecraft's Cthulhu Mythos.
Contributors included James Ambuehl, Robert Bee, R. S. Cartwright, Jason Gridley, Tani Jantsang, Philip Marsh, Duane Pesice and Peter A. Worth.
Eighteen issues of Cthulhu Cultus appeared, the last one in 2001.