The Militia Artillery units of the United Kingdom and Colonies were military reserve units made up of volunteers who served part-time during peacetime, training to take over responsibility for manning fixed artillery batteries from the regular Royal Artillery during times of war.

The Royal Regiment of Artillery, commonly referred to as the Royal Artillery (RA) and colloquially known as "The Gunners", is one of two regiments that make up the artillery arm of the British Army. The Royal Regiment of Artillery comprises thirteen Regular Army regiments, the King's Troop Royal Horse Artillery and five Army Reserve regiments.