Masculinity needs changing. As a manifestation of patriarchy, a predictor of violence, and a straight-jacket of identity, masculinity is widely identified as a culprit and symptom: problematic, traditional, ‘hyper’ and toxic. In response a loose network of feminists and allies, public health professionals, scholar-activists, social workers, civil society groups, international organisations and military and police forces have sought to reform masculinity for the better. [...] This two-day conference will gather academics, practitioners and activists to critically interrogate contemporary masculinity interventions in local, national and transnational layers. What new governance arrangements and sciences of public health are being formed? What power relations are at work, especially across shifting boundaries of global north and south? What is the role of specific political, economic and cultural institutions in propagating new varieties of good masculinity? How are these new masculine subjectivities being produced? And with what effects, whether generative, perilous or ambivalent?