The Chortkiv offensive (Ukrainian: Чортківська офензива, Чортків, Polish: Ofensywa czortkowska, Czortków; 7–28 June 1919) also known as the June offensive, was one of the most successful counteroffensive military operations of the Ukrainian Galician Army (UHA) against the Polish Army during the Polish-Ukrainian War in 1918–1919.

Around 19,000–20,000 Ukrainians pushed back the Poles along the entire front of the 39,000-strong Polish Army, reinforced by the French Third Republic.

On 8 June 1919, the Ukrainian Galician Army, numbering around 19,000–20,000 men, assaulted Chortkiv, forcing the Poles to retreat to the Holohory–Peremyshliany–Bukachivtsi line.

[3] On June 23rd, the Polish forces successfully attacked Holohory, pushing the Ukrainians back beyond the Zolota Lypa river.

[1][2] Due to the support of the French Third Republic in the war, the Polish Army was able to assemble a much larger and more powerful force of around 39,000–40,000 men against the Ukrainian Galician Army, and the Ukrainians were forced to return to their previous positions and abandon the cities and villages they had captured during their recent offensive.