The advent of the World Wide Web created new digital worlds consisting of networked blogs, websites, chatrooms and forums for every topic under the sun (or in the shadows). An unintended side effect of such digital communities is that they have enabled individuals with extreme beliefs to find others to validate their grievances and encourage them to action. One of the largest and most notable of these communities is known as the ‘Manosphere’, an anti-women digital world that foments extreme misogyny, dehumanising women and, at its deepest levels, advocating for violence against all things feminist. This chapter will lay out the contours of the Manosphere and illuminate the major threats arising from this online space.