Raised as 45 Brigade in 1900, it was re-designated as 15 Brigade Royal Field Artillery in August 1913. It became 15 Field Brigade Royal Artillery in June 1924. The Regiment was re-designated as 15 Field Regiment RA from 15 Field Brigade in May 1938. It was re-organised in November 1940 on a two battery basis and became three batteries in November 1942. It served in India, the Middle East and Italy. Post war 15 Field Regiment RA converted to 15 Anti-Tank Regiment RA in January 1946.
Illustrations of the formation badges under which a unit served or supported are given. This is no guarantee that the unit used this formations badge.
| Sep 39 | Lahore area | India | |
| Nov 40 | Rawalpindi area | India | |
| Jan 42 | 2 Indian Armoured Brigade | Iraq | |
| Mar 42 | 252 Indian Armoured Brigade | Iraq | |
| Aug 42 |  |
31 Indian Armoured Division | Iraq |
| Mar 43 | |
31 Indian Armoured Division | Persia (Iran) |
| Sep 43 |  |
Middle East Forces | N Africa |
| Oct 43 | |
31 Indian Armoured Division | N Africa |
| Nov 43 | |
Middle East Forces | N Africa |
| Jul 44 |  |
8 Army | Italy |
Batteries
| Mar 24 | R, S, T, U |
| Nov 40 | S/U, T/R |
| Nov 42 | R, T, S/U |
Equipment
| Jan 44 | 25 pdr Self Propelled Sexton |