The 123rd Field Artillery Regiment is an active Field Artillery Branch regiment of the Illinois Army National Guard.

The regiment's 2nd Battalion last served as a towed, 155mm cannon battalion assigned to the 169th Field Artillery Brigade, though administratively under the control of the 65th Troop Command.

[1] It transitioned to the 123rd Engineer Battalion, which was activated on 22 September 2017.

The 2nd Battalion is currently assigned to the 45th Field Artillery Brigade and is under the administrative control of the 65th Troop Command Brigade.

and relieved from assignment to the 33d Division redesignated as the 33d Infantry Division) with Headquarters Battery and Service Battery, 210th Field Artillery Battalion (organized and Federally recognized 1 March 1954 at Monmouth), and consolidated unit designated as Headquarters Battery and Service Battery, 210th Field Artillery Battalion, elements of the 33d Infantry Division