The Roman Catholic Diocese of Warmia is a diocese located in northern Poland. It is part of the ecclesiastical province of Gdańsk and covers the region of Warmia, which has a rich history and cultural heritage. The diocese was established in the 13th century and has played a significant role in the spiritual life of the area. The diocese is governed by a bishop, who oversees the spiritual and administrative needs of the Catholic community. The cathedral of the diocese is located in Olsztyn, the capital of Warmia-Masuria Voivodeship. The diocese is known for its commitment to education, social services, and promoting the Catholic faith among its parishioners.