The 1st Armoured Infantry Brigade was an infantry brigade of the British Army with a long history including service during both the First and the Second World Wars. It was based at Tidworth Camp. Previously, it has been designated 1st (Guards) Brigade, 1st Infantry Brigade, 1st Mechanised Brigade, and under the initial Army 2020 reforms assumed the title of 1st Armoured Infantry Brigade. Under the Future Soldier programme, the brigade merged with the 1st Artillery Brigade to form the 1st Deep Recce Strike Brigade Combat Team.

The 1st Artillery Brigade was a support formation of the British Army from 1961-77 and from 1997. Part of the 3rd Division, it oversaw all army close support artillery and deep fires units. Under the Future Soldier programme, the brigade merged with 1st Armoured Infantry Brigade to form 1st Deep Reconnaissance Strike Brigade Combat Team.