The Health Development Agency (HDA) was a special health authority established in 2000 to develop the evidence base to improve health and reduce health inequalities. It worked in partnership with professionals and practitioners across a range of sectors to translate that evidence into practice.

As a result of the Department of Health's 2004 review of its "arms length bodies", the functions of the HDA were transferred to NICE on 1 April 2005.

Health Development Agency publications can be found on the British Library Web Archive