The Southwestern Front (Russian: Юго-Западный фронт) was an army group[a] of the Imperial Russian Army during World War I as part of the Eastern Front war theater.

During the conflict it was responsible for managing operations along a front line that stretched 615 kilometers across Ukraine, starting from what is now southern Belarus to northern Romania.

To its left side (south), there was located Romanian Front which was a joint formation of the Russian Empire and the Kingdom of Romania.

In 1917 the headquarters of the Front was located in Berdychiv and later moved west to Rivne.

It was established in August 1914 based on units of the Kiev Military District and the Odessa Military District and lasted throughout the war until the unrest caused by the Russian Revolution, at which point it was demobilized along with the rest of the Russian Army in early 1918.