Abstract: This article describes the move in mental health from institutional care to community arrangements. It draws on international literature and New Zealand health policy, which gives increased emphasis to the role of the primary health care sector in responding to mental health issues. These issues include the need for health promotion, improved detection and treatment of mild to moderate mental illness, and provision of mental health care to some of those with severe mental illness who traditionally receive care in secondary services. These developments challenge specialist mental health nurses to develop new roles which extend their practice into primary health care. In some parts of New Zealand this process has been under way for some time in the form of shared care projects. However developments currently are ad hoc and leave room for considerable development of specialist mental health nursing roles, including roles for nurse practitioners in primary mental health care.