The following list, by battalion, indicates all the units which have formed part of the Regiment and which fall within the Acquisition and Disposal Policy.

1st Battalion

1755 53rd Regiment (Napiers)
1757 51st Regiment (Brudenells)
1783 51st (Second Yorkshire West Riding) Regiment
1809 51st Light Infantry (Second Yorkshire West Riding)
1821 51st King’s Own Light Infantry (Second Yorkshire West Riding)
1881 1st Battalion The King’s Own Light Infantry (South Yorkshire Regiment)
1887 1st Battalion The King’s Own (Yorkshire Light Infantry)
1921 1st Battalion The King's Own Yorkshire Light Infantry
1948 1st Battalion The King's Own Yorkshire Light Infantry (51st-105th)
1968 2nd Battalion The Light Infantry

2nd Battalion

1839 2nd Madras European Light Infantry
1861 105th Regiment of Foot (Madras Light Infantry)
1881 2nd Battalion The King’s Own Light Infantry (South Yorkshire Regiment)
1887 2nd Battalion The King’s Own (Yorkshire Light Infantry)
1921 2nd Battalion The King’s Own (Yorkshire Light Infantry)
1948 To the1st Battalion The King's Own (Yorkshire Light Infantry)

3rd (Militia) Battalion

1757 1st West Yorkshire Militia
1853 1st West York Rifles (Militia)
1881 3rd (Militia) Battalion The King’s Own Light Infantry (South Yorkshire Regiment)
1887 3rd Militia Battalion The King’s Own (Yorkshire Light Infantry)
1907 3rd (Special Reserve) Battalion The King’s Own (Yorkshire Light Infantry)
1919 Suspended animation

4th (Territorial Army) Battalion

1859 Wakefield Volunteer Rifle Corps
1880 5th West Riding Yorkshire Rifle Volunteers
1883 1st Volunteer Battalion South Yorkshire Regiment
1887 1st Volunteer Battalion The King’s Own (Yorkshire Light Infantry)
1908 4th (Territorial) Battalion The King’s Own (Yorkshire Light Infantry)
1921 4th Battalion The King’s Own Yorkshire Light Infantry (Territorial Army)
1947 4 KOYLI (TA) formed as part of 149 (West Riding) Brigade

1967 The Light Infantry Volunteers formed from all county L I regiments companies in Shrewsbury, Truro, Bodmin, Wakefield, Hereford and Durham
1971 6 L I (V) formed based on companies in Truro and Bodmin
1972 5 L I (V) formed based on companies in Shrewsbury, Hereford, Wakefield and Durham
1975 7 L I (V) formed based on the company in Durham
1987 8 L I (V) formed based on the company in Wakefield
1996 8 L I (V) converted to a cavalry regiment as KOYY (L I)
1999 KOYY(L I) reduced to one company named Minden (Light Infantry) company
and became part of the new East and West Riding Regiment

5th (Territorial Army) Battalion

1908 5th (Territorial) Battalion The King’s Own (Yorkshire Light Infantry)
1921 5th Battalion The King’s Own Yorkshire Light Infantry (T.A.)
1938 53rd Light Anti Aircraft Regiment R.A. (T.A.)
and
1939 57th Light Anti Aircraft Regiment R.A. (T.A.)
1947 553 (KOYLI) Light Anti Aircraft Regiment R.A. (T.A.)
557 (KOYLI) Mixed Heavy A.A. Regiment R.A. (T.A.)
1956 553 and 557 Regiments were amalgamated with 323 L.A.A. Regiment and
R. (KOYLI) Battery R.A. (T.A.) came into being
1961 Amalgamated with 271 (S.A.V.) Lt. Air Defence Regiment R.A. (T.A.)
And R. (KOYLI) Battery