HQ Northern Ireland was the formation responsible for the British Army in and around Northern Ireland. It was established in 1922 and disbanded, replaced by a brigade-level Army Reserve formation, 38 (Irish) Brigade, in 2009.

The 38th (Irish) Brigade, is a brigade formation of the British Army that served in the Second World War. It was composed of North Irish line infantry regiments and served with distinction in the Tunisian and Italian Campaigns. Following the end of the war, the brigade was disbanded, but was reformed in sixty years later in 2007 and remains the regional formation for Northern Ireland.