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- Leffe Abbey (Abbaye Notre-Dame de Leffe) (extant) at Leffe, Dinant (Namur): Premonstratensians
- Liège:
- Peace of Our Lady Abbey, Liège (Abbaye de la Paix-Notre-Dame de Liège): Benedictine nuns
- St. James' Abbey, Liège (Abbaye Saint-Jacques de Liège): Benedictine monks
- St. Laurence's Abbey, Liège (Abbaye Saint-Laurent de Liège): Benedictine monks
- Lier Abbey or Abbey of Our Lady of Nazareth, Lier (Abdij van Onze Vrouwe van Nazareth) (later refounded at Brecht: see Brecht Abbey) at Lier (Antwerp): Trappist nuns
- Lier, see Hemiksem
- Lieu-Saint-Bernard Abbey, otherwise Abbaye Saint-Bernard-sur-l'Escaut: see St. Bernard's Abbey, Hemiksem
- Lobbes Abbey (Abbaye Saint-Pierre de Lobbes) (dissolved) at Lobbes, Hainaut: Benedictine monks
- Leuven (Flemish Brabant):
- Groot Begijnhof, Leuven
- St. Gertrude's Abbey, Leuven: Augustinian Canonesses
- St. Monica's, Leuven: Augustinian Canonesses
- St. Michael's College, Leuven: Jesuits
- Louvain-la-Neuve, see St. Gertrude's Abbey
Read more about this topic: List Of Christian Religious Houses In Belgium