The Borough of Milton Keynes is a unitary authority area and borough of the ceremonial county of Buckinghamshire. It is the northernmost district of the South East England Region.

It borders the non-metropolitan counties of Buckinghamshire (the area under the control of Buckinghamshire County Council), Bedfordshire and Northamptonshire. The principal settlement in the borough is Milton Keynes itself, which accounts for about 33% of its area and 90% of its population.

The district was created on 1 April 1974 under the Local Government Act 1972, by the merger of Bletchley Urban District, Newport Pagnell Urban District and Wolverton Urban District, Newport Pagnell Rural District and that part of Wing Rural District within the designated New Town area. The district council applied for and received borough status that year.

It was originally one of five non-metropolitan districts of Buckinghamshire, but on 1 April 1997, under a recommendation of the Local Government Commission for England it became a self-governing unitary authority, independent from Buckinghamshire County Council.

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