Metanoia was a science fiction fanzine by Greg Shaw.
Metanoia was released in the 1970s. Arnie Katz, in his article "What Are The Greatest Fanzine?", in Vegas Fandom Weekly #99, from July 2007, writes, "Greg Shaw inspired a vogue for small, personal fanzine in the mid-1970s with this zine, which remained tops in the boomlet it created."
Greg Shaw had previously published Feemwlort, and Entmoot, a fanzine devoted to Tolkien and his books, both titles released in the mid 1960s. He went on to publish music fanzines such as Mojo-Navigator Rock & Roll News and, Bomp!.