The 1st Army was a field army-level command in the ground forces of Austria-Hungary during World War I. The army fought in Galicia and Russian Poland in 1914–15 before being briefly dissolved in the summer of 1916. Shortly afterwards, it was reformed and sent to fight in the Romanian Campaign for the next two years. The 1st Army was demobilized in April 1918 due to its heavy losses, following Romania's surrender.

The Austro-Hungarian Army, also known as the Imperial and Royal Army, was the principal ground force of Austria-Hungary from 1867 to 1918. It consisted of three organisations: the Common Army, the Imperial-Royal Landwehr and the Royal Hungarian Honvéd.