Prohibited Matter was a fanzine published by Rod Marsden.
Released in New South Wales, Australia, the subtitle of the fanzine was "Crime, Horror, Science Fiction" and these were the areas of interest.
The first issue appeared in 1993. Ten issues were published in total, with the last issue released in May 1999.
Contributors of articles included Don Boyd, Rod Marsden, Keith Rex, and P. J. Roberts, among others.
Contributors of fiction included Don Boyd, Steve Carter, Robert James Conlon, Barbara Custer, Denise Dumars, G. Ivanoff, Geoff Jackson, D.F. Lewis (Nemonymous), Rod Marsden, Lynn McConchie, Todd Mechklem, R. G. Riel, Keith Rex, Antoinette Rydyr, Pauline Scarf, Bo Widerberg, and Boris Zelensky, among others.
Contributors of artwork included Steve Carter, Antoinette Rydyr, and Amanda Steele, among others.
In his regular column, "The State of the Nightmare", Leigh Blackmore contributed reviews.