The Regiment Infanterie Oranje Gelderland is a mechanized infantry regiment of the Royal Netherlands Army.

Re-established in 2006 it forms the mechanized infantry battalion 45 Painfbat RIOG.

It operates the newly acquired CV90 Infantry fighting vehicle.

On Prinsjesdag 2013, it was announced that the 45th PIB RIOG would be disbanded due to defense cuts.

However, the 2014 budget agreements indicated that disbanding was no longer planned.