The Middlesex County Football Association is an organisation that regulates and promotes football, aiming to increase the quantity and quality of participation in the historic area of Middlesex.
The Middlesex F.A. was founded in 1883 by the Football Association. Nicholas Lane Jackson, who had helped found the Corinthians in 1882, organised the founding of the association, and became its first chairman. The association left the Football Association in 1907 to join the Amateur Football Association, but it soon returned. It moved to its current headquarters at Roxborough Road in Harrow in 1975. It did not employ any full-time staff until 1992.
The Middlesex F.A. covers the historic extent of Middlesex and the entirety of the boroughs of Richmond upon Thames and Barnet. This area overlaps with the scope of the London Football Association, the Surrey County Football Association and Hertfordshire County Football Association. This means that many clubs are eligible for affiliation with more than one county football association, such as Ashford Town (Middlesex) who are affiliated to Middlesex and Surrey and Potters Bar Town who are affiliated to Middlesex and Hertfordshire.
The Middlesex F.A. organises the following cup competitions: