The 1st Guides Regiment (French: 1e Régiment des Guides, Dutch: 1e Regiment Gidsen) was an armoured regiment of the Belgian Army. Previously amalgamated with the 1st Regiment Chasseurs à cheval (2004), in 2011 the regiment was amalgamated with 2/4 Regiment of Chasseurs à cheval to form the "Intelligence, Surveillance, Target Acquisition, Reconnaissance (ISTAR) battalion of the Chasseurs à cheval".
The two historic Guides regiments of the Belgian Army were created respectively in 1833 and 1874. They formed part of the light cavalry and came to correspond to the Guard cavalry of other nations, providing mounted escorts for the monarchy prior to World War I. Both regiments were mechanized in October 1937, subsequently forming armored battalions in the post-war Belgian Army. The mounted tradition survived until 2011 in the form of a pony retained as the regimental mascot, and always named "Colback".
The modern regiment was formed in 1994 by the amalgamation of the (Francophone) 1er Régiment des Guides and the (Dutch-speaking) 2de Regiment Gidsen, following a reorganization of the army. The amalgamation saw both regiments withdrawn as operational units, with the name of the new unit, together with the combined battle honours of its antecedents, assigned to the Cavalry Training School (L’école de cavalerie/Pantsercavalerieschool). In addition to this role, the regiment had a reserve role as an armoured regiment, attached to the 17th Mechanised Brigade, which was Belgium's main force stationed in Germany. This role ended in 2002.
The following year, the regiment was reduced to a single squadron and reactivated as an operational unit. The Eskadron Gidsen was formed as a reconnaissance unit to be attached to the army's Para-Commando Brigade, replacing 3 Regiment Lanciers-Parachutisten. In 2004, the squadron was merged with the 1st Regiment Jagers the Paard, under the combined regimental title of 1ste Regiment Jagers te Paard/Gidsen.