The 17th (Service) Battalion, Middlesex Regiment was an infantry battalion of the Middlesex Regiment, part of the British Army, which was formed as a Pals battalion during the Great War. The core of the battalion was a group of professional footballers, which was the reason for its most commonly used name, The Football Battalion. The 23rd (Service) Battalion, Middlesex Regiment was formed in June 1915 and became known as the 2nd Football Battalion. The battalions fought in the Battle of the Somme in 1916 among others. Soldiers who fought in the 17th and 23rd Battalions included Second Lieutenant Walter Tull, who was possibly the first black infantry officer in the British Army.

The Middlesex Regiment (Duke of Cambridge's Own) was a line infantry regiment of the British Army in existence from 1881 until 1966. The regiment was formed, as the Duke of Cambridge's Own (Middlesex Regiment), in 1881 as part of the Childers Reforms when the 57th (West Middlesex) and 77th (East Middlesex) Regiments of Foot were amalgamated with the county's militia and rifle volunteer units.