Monthly Magazine Z was a Japanese seinen mixed-media magazine published by Kodansha, aimed at adult males, but particularly at hardcore anime and manga fans, featuring articles as well as manga tied into popular franchises. Original manga were also featured in the magazine.

Kodansha Ltd. is a Japanese privately held publishing company headquartered in Bunkyō, Tokyo. Kodansha publishes the manga magazines Nakayoshi, Afternoon, Evening, Weekly Shōnen Magazine, and Bessatsu Shōnen Magazine, as well as the more literary magazines Gunzō, Shūkan Gendai, and the Japanese dictionary Nihongo Daijiten. Kodansha was founded by Seiji Noma in 1910, and members of his family continue as its owners either directly or through the Noma Cultural Foundation.