The Royal Welsh (R WELSH) (Welsh: Y Cymry Brenhinol) is an armoured infantry regiment of the British Army. It was established in 2006 from the Royal Welch Fusiliers (23rd Foot) and the Royal Regiment of Wales (24th/41st Foot).

The regiment's formation was announced on 16 December 2004 by Geoff Hoon and General Sir Mike Jackson as part of the restructuring of the infantry and it was actually formed on St David's Day, 1 March 2006. The Royal Welsh initially consisted of two Regular Army battalions, plus an Army Reserve battalion. The former regiments formed part of the battalion title (in brackets):

The 1st battalion deployed to Afghanistan in October 2007, October 2009 and April 2012.

In July 2007 the 2nd battalion deployed to Iraq and between 2009 and 2011 the battalion deployed companies to Afghanistan.

The 2nd battalion merged with 1st battalion to form a single battalion, the 1st Battalion, The Royal Welsh on 2 April 2014.

The 1st Battalion, The Royal Welsh is a Regular Army armoured infantry battalion based at Tidworth Camp. It comes under 12th Armoured Infantry Brigade with HQ at Bulford Camp in Wiltshire.

The 3rd Battalion, The Royal Welsh is an Army Reserve light infantry battalion based at Maindy Barracks in Cardiff, with company locations in Swansea, Pontypridd, Aberystwyth and Colwyn Bay. Paired with 1st Battalion The Royal Welsh, it also comes under 12th Armoured Infantry Brigade.

The Regimental Museum of The Royal Welsh is at The Barracks, Brecon. Meanwhile Firing Line: Cardiff Castle Museum of the Welsh Soldier is based at Cardiff Castle