The Government Actuary's Department (GAD) provides actuarial solutions including risk analysis, modelling and advice to support the UK public sector.

In 1912 the Government appointed a chief actuary to the National Health Insurance Joint Committee, following the Old Age Pensions Act 1908 and the National Insurance Act 1911.

The role of GAD within government expanded significantly in the 1940s and 1950s, coinciding with an expansion of the state's role in pensions, social security and health care.

The calculation of GAD's fees is based solely on the recovery of its costs.

GAD has about 200 people across 2 offices (London and Edinburgh), of whom around 165 are actuaries and analysts.