The Diocese of Carcassonne is a Roman Catholic diocese located in the south of France. It was established in the 3rd century and is part of the Province of Montpellier. The diocese covers the area around the city of Carcassonne, known for its medieval fortress and rich history. The diocese is responsible for the spiritual and administrative needs of the Catholic community in its region. It includes several parishes and is led by a bishop, who oversees religious services, education, and community outreach. The Cathedral of Saint Michel serves as the diocese's main church.