List of battalions of the Durham Light Infantry

This is a list of battalions of the Durham Light Infantry, which existed as a regiment of the British Army from 1881 to 1968.

When the 68th Regiment of Foot and the 106th Regiment of Foot became the Durham Light Infantry (DLI) in 1881 under the Cardwell-Childers reforms of the British Armed Forces, seven pre-existing militia and volunteer battalions of County Durham were integrated into the structure of the DLI. These latter battalions had existed intermittently for some time, but had been made permanent in reaction to a perceived threat of invasion by France the late 1850s. The militia, in two battalions, were more appealing to the working classes as the equipment was government funded, while the volunteers were organised as "rifle volunteer corps", independent of the British Army, financially self-supporting and composed primarily of the middle class, they underwent a number of reorganisations before reaching the form in which they were incorporated into the county regiment.

In December 1887 the Durham Rifle Volunteer Battalions were renamed as Volunteer Battalions of the Durham Light Infantry retaining their numbers.

The Territorial Force (renamed the Territorial Army in 1920) was formed in 1908, from the volunteer infantry battalions of the county regiments, and other volunteer arms. The militia battalions transferred to the "Reserve" or the "Special Reserve". The 3rd and 4th battalions exchanged numbers that year, and were recast as the 3rd (Reserve) and 4th (Extra Reserve) battalions in a draft finding role. The reason for this apparently pointless exchange of numbers was that in the event of a mobilisation the War Office intended to use the 3rd battalion of a regiment to provide reinforcements for the regular battalions, while if a regiment had a 4th battalion it would be mobilised as a whole unit. The older unit (1st Durham Fusiliers, then the 3rd battalion) wished to remain as a fighting unit, and so exchanged numbers. All volunteer battalions were renumbered to create a single numerical sequence.

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