The Diocese of Arlington is a Latin diocese of the Catholic Church in Northern Virginia in the United States. It is a suffragan diocese in the ecclesiastical province of the Archdiocese of Baltimore. The Cathedral of St. Thomas More is the mother church of the diocese.
- Country
- United States
- Headquarters
- Arlington County
- Inception
- May 28, 1974
- Website
- http://www.arlingtondiocese.org