The National Mental Health Development Unit (NMHDU) was a governmental organisation in England charged with supporting the implementation of mental health policy.
The unit worked to achieve this by advising on best practice for improving mental health and mental health services.
The unit was launched in 2009, following the abolition of the National Institute for Mental Health in England (NIMHE).
The Unit had several specific programmes of activity, including to support the Improving Access to Psychological Therapies (IAPT) scheme.
The Unit also supported the government's strategy for mental health, New Horizons, which was published in December 2009 following the end of the National Service Framework plans.