A
- Achel Abbey (Sint-Benedictusabdij van Achel, de Achelse Kluis or Onze-Lieve-Vrouw-van-La-Trappe-van-de-Heilige-Benedictus) (extant), part in Hamont-Achel, Limburg, Belgium, and part in Valkenswaard, the Netherlands: Trappist monks
- Affligem (Flemish Brabant):
- Affligem Abbey (Abdij van Affligem) (extant) at Hekelgem: Benedictine monks
- Saints Mary and Wivina's Abbey, Affligem (dissolved) (Abdij Maria Mediatrix en Sant Wivina): Benedictine nuns
- Aldeneik Abbey (Abdij van Aldeneik) at Aldeneik, Maaseik, Limburg: Benedictine nuns, later canons regular
- Amay, former commune of Jehay (Liège):
- Amay Abbey (Abbaye de la Paix-Dieu d'Amay) (dissolved): Cistercian nuns
- Amay Priory (Prieuré d'Amay), founded in the former premises of Amay Abbey above, and later moved to form Chevetogne Abbey: Benedictine monks
- Antwerp:
- St. Saviour's Abbey, Antwerp (Abdij SintSalvator Antwerpen): Cistercian monks
- Antwerp Charterhouse: Carthusians
- Argenton Abbey (Abbaye d'Argenton) at Lonzée, Gembloux (Namur): Cistercian nuns
- Assebroek, see Steenbrugge
- Ath Abbey (Abbaye Notre-Dame du Refuge d'Ath) at Ath (Hainaut): Cistercian nuns
- Aubechies Abbey (Abbaye de la Sainte-Trinité et de Saint-Géry d'Aubechies) at Aubechies (Hainaut): Benedictine monks
- Aulne Abbey (Abbaye d'Aulne) at Gozée (Hainaut): Benedictine monks, then secular clergy, then Augustinian canons, then Cistercian monks
- Averbode Abbey (Abdij van Averbode) (extant) at Averbode, Scherpenheuvel-Zichem (Flemish Brabant): Premonstratensians
- Aywiers Abbey (Abbaye d'Aywiers) at Aywiers, Couture-Saint-Germain, Lasnes (Walloon Brabant): Cistercian nuns
Read more about this topic: List Of Christian Religious Houses In Belgium