| Dates | Locations | Batteries | Remarks |
| | | |
| | 3rd Field Regiment Royal Horse Artillery | | |
| 1947.04 | Germany: Crerra Bks, Oldenburg | D, J and M Fd Btys RHA | 25pdr / SPs |
| 1948.04 | Germany: Caithness Bks, Verden | D, J and M Fd Btys RHA | 25pdr / SPs |
| 1950.11 | Germany: Dennis Bks, Munsterlager (D & J Btys) | D, J and M Fd Btys RHA | Sexton: part of 7th Armoured Div |
| Jan 51: Knockenhaus Bks, Munsterlager (M Bty) | | |
| | Jul 52: Dennis Bks, Munsterlager (M Bty) | | |
| 1953.11 | England: | D, J and M Fd Btys RHA | |
| 1954.02 | Egypt: Waterloo Camp, Fayid | D, J and M Fd Btys RHA | Sexton |
| Jul 54: Homs, Libya (J Bty) | | |
| | Oct 55: El Ballah, Egypt (Not J Bty) | | |
| 1956.03 | Libya: Homs | D, J and M Fd Btys RHA | Sexton |
| 1957.05 | England: Wing Bks, Bulford | D, J and M Fd Btys RHA | 5.5” Gun |
| | 1 Feb 58: C Bty joined from 5 RHA and M Bty went into suspended animation | C, D and J Fd Btys RHA | |
| 1959.04 | England: Cambrai/Cachy Bks, Perham Down | C, D and J Fd Btys RHA | 5.5” Gun |
| Sep 60: Aden: Seederseer Lines (C Bty) | | |
| | Sep 60: Re-equipped with 105mm Pack Howitzer | | 105mm Pack Howitzer |
| 1961.09 | Kenya, Alanbrooke Bks, Gil Gil; Aden: Seederseer Lines (C Bty) | C, D and J Fd Btys RHA | 105mm Pack Howitzer |
| Dec 1961: Renamed 3rd Air-Portable Regiment Royal Horse Artillery | C, D and J Btys RHA | |
| Jan - Aug 62: Aden: Seederseer Lines (J Bty) | | |
| Aug 62 - Feb 63: Aden: Seederseer Lines (D Bty) | | |
| Feb - Jul 63: Aden: Seederseer Lines (C Bty) | | |
| Jul 63 - Jan 64: Aden: Seederseer Lines (J Bty) | | |
| Jan - ? 64: Aden: Seederseer Lines (D Bty) | | |
| Jan 64: Trouble broke out in Zanzibar, 3 RHA put down the revolt | | |
| | Mar 1964: Renamed 3rd Light Regiment Royal Horse Artillery | C, D and J Lt Btys RHA | |
| 1964.09 | England: Airfield Camp, Netheravon | C, D and J Lt Btys RHA | 105mm Pack Howitzer |
| 1965.04 | Germany: Hobart Bks, Detmold | | |
| May 1965: Renamed 3rd Medium Regiment Royal Horse Artillery | C, D and J Med Btys RHA | Abbot |
| 1965: Borneo (3 Loc Troop) | | |
| | Apr 1966: Renamed 3rd Field Regiment Royal Horse Artillery | C, D and J Fd Btys RHA | |
| 1970.05 | England: Kirkee Bks, Colchester | C, D and J Fd Btys RHA | 105mm Pack Howitzer: Sp to 19 Infantry Bde |
| 7 Sep 70 - 21 Jan 71: Northern Ireland (Rural Tour) | | |
| 1 - 15 Jul 70: Northern Ireland (Rural Tour) | | |
| 21 Jul - 17 Aug 71: Northern Ireland Tour (Ballykelly) | | |
| 28 Dec 71 - 27 Apr 72: Northern Ireland, East Belfast (Andersonstown/Lower Falls). | | |
| | 1 Sep - 16 Nov 72: Northern Ireland, Londonderry | | |
| 1973.02 | Hong Kong: Borneo Lines, Sek Kong Camp | | |
| | Feb 73: Renamed 3rd Light Regiment Royal Horse Artillery | C, D and J Lt Btys RHA | 5.5” Gun (? Bty) |
| 1975.03 | England: Hopton Bks, Devizes | | |
| Mar 1975: Renamed 3rd Medium Regiment Royal Horse Artillery | C, D and J Med Btys RHA | 5.5” Gun |
| Sep 1975: M Bty reformed and equipped with 105mm Pack Howitzer | C, D, J and M Med Btys RHA | 5.5” Gun & 105mm Pack Howitzer |
| 24 Jan – 25 May 76: Northern Ireland, Belfast (North Queen Street) | | |
| Dec 1977: Suspended Animation | | |
| C Bty to Germany: Mansergh Bks, Gutersloh | | Swingfire |
| D Bty to Germany: Haig Bks, Hohne | | Swingfire |
| J Bty to Germany: Barker Bks, Paderborn | | Swingfire |
| M Bty to Germany: West Riding Bks, Dortmund | | Swingfire |
| | | |
| Reformed | | |
| 1984.04 | Reformed as 3rd Field Regiment Royal Horse Artillery | | |
| 1984.04 | Germany: Barker Bks, Paderborn | C, D and J Fd Btys RHA | Abbot |
| Apr to ? 85: C Bty - Northern Ireland | | |
| | Nov 1988: Cyprus | | UN Tour |
| 1990.02 | England: Kirkee Bks, Colchester | C, D and J Fd Btys RHA | FH70 |
| 1993.07 | England: Alanbrooke Bks, Topcliffe | | FH70 |
| Jul 93: N Bty joined Regt from 2 Field Regt, M Bty reformed as M/HQ Bty
| C, D, J, N and M/HQ Btys RHA | |
| Dec 93: Re-titled 3rd Regiment Royal Horse Artillery | | |
| Apr 1991: Belize (D Bty) | | |
| Apr 1991: Northern Ireland (C Bty) | | |
| Oct 1992: Northern Ireland | | |
| Sep 94: Re-equipped with AS90 | | AS90 |
| | Sep 96 - Apr 97: Northern Ireland Tour | | |
1998.07
| Germany: Caen Bks, Hohne
| C, D, J, N and M/HQ Btys RHA | AS90
|
| 1998 - 1999: Bosnia 'Op Palatine' | | Part of regiment deployed |
| Jan to ? 99: Bosnia | | |
| 1999: N Bty amalgamated with L Bty and joined 1 RHA. | | |
| Dec 00 - Jun 01: Bosnia (C) / Kosovo (D & M/HQ) 'Op Resolute' | | |
| Mar 03 - ??: Gulf War, Iraq 'Op Telic 1' | | |
| Dec 03 - ??: Cyprus UN 'Op Tosca' | | |
| 2005 - 06: Iraq 'Op Telic 7' | | |
| 2007 - 08: Iraq 'Op Telic 11' | | Part of regiment deployed |
| 2008: Afghanistan 'Op Herrick 8' | | Part of regiment deployed |
| 2008: Iraq 'Op Telic 12' | | Part of regiment deployed |
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