Lubaczow was first mentioned in written documents in 1214, when, following the Spis Treaty between Duke Leszek I the White and Andrew II of Hungary, the gord was placed under authority of Voivode of Sandomierz, Pakosław Lasocic.

In 1868, the Austrian authorities moved the seat of the county to nearby Cieszanów, while in 1880, Lubaczow received a rail connection with Jarosław.

In mid-September 1939, during the Invasion of Poland, heavy fighting between the advancing Wehrmacht and retreating Polish 21st Mountain Infantry Division commanded by General Jozef Kustron.

After World War II, Lubaczów was one of few locations of the Roman Catholic Archdiocese of Lwów to remain within Poland, when the national boundaries were redrawn in 1945.

Among them was the miraculous picture of Our Lady of Bełz, relics of Blessed Jakub Strzemie, and the urn with heart of Archbishop Jozef Bilczewski.