The Ministry of Pensions and National Insurance (MPNI) was a British government ministry responsible for the administration and delivery of welfare benefits.

It was headed by the Minister of Pensions and National Insurance.

It was created in 1953 as a result of the amalgamation of the Ministry of Pensions and the Ministry of National Insurance.

[1] In 1966, the Supplementary Benefits Commission (part of the National Assistance Board) was merged with the Ministry of Pensions and National Insurance to form the new Ministry of Social Security, as part of the Ministry of Social Security Act 1966.

[2] In 1968, the Ministry of Social Security and the Ministry of Health were dissolved and their functions merged into the new Department of Health and Social Security.