| Unit Name: | 4th/3rd Battalion, Royal New South Wales Regiment |
| Country: |  Australia |
| Type: | Light infantry |
| Branch: | Army |
| Dates: | 26 September 1987 – present |
| Command Structure: | 5th Brigade |
| Size: | One battalion |
| Garrison: | Sutherland, New South Wales |
| Ceremonial Chief Label: | Colonel-in-Chief |
| Motto: | For Home and Country |
| Colors: | White and green |
| Colors Label: | Colours |
| Identification Symbol Label: | Unit colour patch |
| March: | Quick, Slow |
| Anniversaries: | ANZAC Day |
4th/3rd Battalion, Royal New South Wales Regiment (4/3 RNSWR) is a Reserve light infantry battalion of the Australian Army. 4/3 RNSWR has been deployed on active service on many peacekeeping operations and exercises within Australia and around the world. The Battalion is currently based at Sutherland, New South Wales where it forms part of the 5th Brigade.
The 1987 reorganisation of the Army Reserve, involving a reduction in the number of infantry battalions across Australia, brought about a linking of the 3rd and 4th Battalions, and a public ceremony on 26 September of that year marked the presence of the new 4/3 RNSWR.[1]
The new battalion, now extending across south-eastern New South Wales, has continued its standard training programmes in pursuit of its operational readiness objectives.
Significant groups of unit members attended the Royal Regiment of Wales Tercentenary celebrations in Cardiff, in 1989, and the 75th Anniversary Commemoration at Gallipoli in 1990, and the unit has had ongoing involvement in Australian and overseas exercise training programmes.
Operation Anode is the Australian Defence Force's role in supporting RAMSI (Regional Assistance Mission to the Solomon Islands). Soldiers from 4/3 RNSWR has supported RAMSI in multiple brigade led deployments as a peacekeeping force to assist local and international police force's in the re-stabilisation of the Solomon Islands in conjunction with the New Zealand, Papua New Guinea and Tongan defence forces.
Operation Astute was an Australian-led military deployment to East Timor to quell unrest and return stability in the 2006 East Timor crisis.
Operation Resolute is commanded by the joint civilian-military Border Protection Command and the ADF contributes Royal Australian Navy ships, Royal Australian Air Force aircraft and patrols from the Australian Army's Regional Force Surveillance Units as required. Soldiers from 4/3 RNSWR have been regularly deployed on OP Resolute.
The 3rd Battalion received the following battle honours:[2]
The 4th Battalion received the following battle honours:[6]
| Dates | Name | |
|---|---|---|
| 26 Sep 87 – 31 Jan 89 | LTCOL F.G. Harvison, RFD | |
| 1 Feb 89 – 24 Mar 91 | LTCOL P.F. Murphy, RFD | |
| 25 Mar 91 – 31 Dec 93 | LTCOL M.F. Peebles, RFD | |
| 1 Jan 94 – 31 Dec 96 | LTCOL M. Vertzonis, RFD | |
| 1 Jan 97 – 31 Dec 99 | LTCOL P. Brereton, RFD, SC | |
| 1 Jan 01 – 31 Dec 01 | LTCOL T. Vail, RFD | |
| 01 Jan 02 – 31 Dec 03 | LTCOL A.M. Bell, RFD | |
| 01 Jan 04 – 31 Dec 05 | LTCOL L.G Lucas | |
| 1 Jan 06 – 31 Dec 07 | LTCOL G.R Weir | |
| 1 Jan 08 – 31 Dec 09 | LTCOL M.J Callan | |
| 1 Jan 10 – 31 Dec 12 | LTCOL M.A. Sasse | |
| 1 Jan 13 – 31 Dec 14 | LTCOL R.J. Miller | |
| 1 Jan 15 – 31 Dec 17 | LTCOL A.P. Bailey | |
| 1 Jan 18 – 31 Dec 20 | LTCOL D. Charlton | |
| 1 Jan 21 - present | LTCOL P. Hukins |
4/3 RNSWR currently consists of:[12]