MHPSS.net is a global south-led knowledge exchange platform for mental health and psychosocial support (MHPSS) in humanitarian, development and peacebuilding contexts. The network serves practitioners, researchers and policy-makers in LMIC and high-income crisis settings, with over 10,000 members worldwide and users from nearly every country or territory. It works closely with the UN-led global humanitarian system as well as with regional and country-level mental health and psychosocial networks in Asia, Africa, Europe, Latin America and the Caribbean. This is the platform’s 15 year as a key platform supporting MHPSS coordination and field implementation in major crises worldwide.