A
- Aachen:
- Aachen Priory: Dominicans 1293–1802; Sisters of the Poor Child Jesus 1842–today
- Alexian Hospital, Aachen (with St. Alexius' Church) (Alexianer Krankenhaus Aachen and Alexiuskirche Aachen): Alexians 1334–today
- Christenserine motherhouse (14th century – 1973; moved to the Haus Maria im Venn, Stolberg)
- Convent of the Poor Sisters of Saint Francis, Aachen: Poor Sisters of Saint Francis, also known as the Schervier Sisters, 1852–today
- St. Anne's Abbey or Priory, Aachen, now St. Anne's Church, Aachen (Kloster St. Joachim und Anna, now the Annakirche): Benedictine nuns 1511–1794
- St. Jöris' Abbey, see St. Jöris
- Abdinghof Abbey or Priory (Abdinghofkloster), Paderborn: Benedictine monks 1015–1803
- Altenberg Abbey (Abtei Altenberg), Altenberg: Cistercian monks 1133–1803
- Arnsberg:
- Jesuit Mission, Arnsberg (Jesuitenmission Arnsberg) 1651–1773
- Attendorn:
- Attendorn Friary (Franziskanerkloster Attendorn): Franciscan friars 1636–1803
- Ewig Priory, Attendorn, see Ewig
- Waldenburg Commandery, Attendorn, see Waldenburg
Read more about this topic: List Of Christian Religious Houses In North Rhine-Westphalia