List of regiments of the Royal Artillery (1938–1947)

This list of regiments of the Royal Artillery covers the period from 1938, when the RA adopted the term 'regiment' rather than 'brigade' for a lieutenant-colonel's command comprising two or more batteries, to 1947 when all RA regiments were renumbered in a single sequence.

In 1938 the RA was organised in two main branches: Field, and Coast Defence and Anti-Aircraft (CD&AA) (including anti-tank). The two branches had separate depots and administrative staffs, but the main difference was in equipment and tactical employment. However, these differences broke down as World War II progressed, when units took on multiple roles, good examples being the employment of heavy anti-aircraft guns in the medium artillery and anti-tank roles.

In this list 'Reg' denotes a prewar unit of the Regular Army, 'SR' denotes Supplementary Reserve, 'TA' denotes Territorial Army, including duplicate units; all others were 'war-formed' (even if some were apparently designated TA). TA duplicate units were granted their subsidiary titles in February 1942. 'Mixed' indicates a unit in which a large proportion of the personnel were women of the Auxiliary Territorial Service. 'S/A' indicates an established Regular or TA unit placed in 'suspended animation' (as opposed to disbandment)

Royal Horse Artillery

Traditionally the Royal Horse Artillery (RHA) provided highly mobile light field guns to support cavalry formations. By 1939 the RHA was – like the rest of the RA – completely mechanised, but its role remained essentially the same: provision of mobile artillery to armoured formations. As World War II progressed, this was increasingly achieved using Self-Propelled (SP) guns.