Mental health is an increasing concern around the world, but there is a substantial gap in terms of access to quality mental healthcare between Western and non-Western countries. To help close this gap and improve the delivery of mental health and psychosocial support services (MHPSS), the UN’s 2016 Grand Bargain declared a new approach of prioritising the localisation of these services. This paper examines the effects of the Grand Bargain on the localisation of mental health and psychosocial support services in non-Western countries, as a means to decolonise mental health.