The Imperial Russian Army (Russian: Ру́сская импера́торская а́рмия, romanized: Rússkaya imperátorskaya ármiya) was the army of the Russian Empire, active from 1721 until the Russian Revolution of 1917. It was organized into a standing army and a state militia. The standing army consisted of regular troops and two forces that served on separate regulations: the Cossack troops and the Muslim troops.
A regular Russian army existed after the end of the Great Northern War in 1721. During his reign, Peter the Great accelerated the modernization of Russia's armed forces, including with a decree in 1699 that created the basis for recruiting soldiers, military regulations for the organization of the army in 1716, and creating the College of War in 1718 for the army administration. Starting in 1700 Peter began replacing the older Streltsy forces with new Western-style regiments organized on the basis of his already existing Guards regiments.