Public Health Wales (PHW; Welsh: Iechyd Cyhoeddus Cymru) is an NHS Trust which was established on 1 October 2009 as part of a major restructuring of the health service in Wales. It aims to protect and improve health and wellbeing and reduce health inequalities in Wales.

The Trust has four statutory functions:

For 2018/19 Public Health Wales employed 1,651 staff across Wales, with an income of £135 million.

A board is responsible for Public Health Wales’ strategic direction, governance framework, organisational culture and development and stakeholder relations. It comprises a chair, six non-executive directors and five executive directors, led by a chief executive. Jan Williams OBE FRSPH is the chair.

The executive directors and three other board-level directors make up the executive team, which manages Public Health Wales. Each year Public Health Wales is required to conduct a self-assessment and demonstrate improvement against the Healthcare Standards for Wales.

The organisation is split into seven key directorates:^{[citation needed]}