The Diocese of Albi is a Roman Catholic diocese located in the southern part of France. It was established in the 3rd century and is part of the Province of Toulouse. The diocese covers the Tarn department and has its seat in the city of Albi, known for its stunning Albi Cathedral, a UNESCO World Heritage site. The diocese is led by a bishop, who oversees the spiritual and administrative needs of the local Catholic community. The Diocese of Albi is known for its rich history, including its role during the Albigensian Crusade, which targeted the Cathar movement in the region.