The Diocese of Arlington is a Roman Catholic diocese located in northern Virginia, established in 1974. It serves a diverse population of over 600,000 Catholics across 21 counties and the city of Alexandria. The diocese is part of the United States Conference of Catholic Bishops and is dedicated to spiritual growth, education, and community service. The diocese is led by a bishop, currently Bishop Michael F. Burbidge, who oversees various parishes, schools, and ministries. The Diocese of Arlington emphasizes the importance of evangelization, social justice, and the promotion of family life within its communities.