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- Kamp Abbey (Kloster Kamp or Altenkamp), Kamp-Lintfort: Cistercian monks 1123-1802; Carmelites 1954-2002
- Kappenberg, see Cappenberg
- Kentrop Priory (Haus Kentrop otherwise Kloster Kentrop), Hamm: Cistercian nuns 1290-1802 (moved here from Marienhof)
- Keppel Abbey (Stift Keppel), Allenbach, Hilchenbach: Premonstratensian nuns 1236-1594; women's collegiate foundation 1594-1812
- Knechtsteden Abbey (Kloster Knechtsteden), Dormagen: Premonstratensian Canons 1138-1801; Spiritans 1895-today
- Königsmünster Abbey (Abtei Königsmünster), Meschede: Benedictine monks 1928-today
- Kornelimünster Abbey (Abtei Kornelimünster), Kornelimünster, Aachen: Benedictine monks 814-1802, 1906-today
- Kranenburg:
- Katharinenhof Kranenburg: Augustinian women's community 1445-1802
- St. Martin's Priory (Stift St. Martin, Kranenburg): canons, 1436-1802 (moved here from Zyfflich)
- Kreitz Priory (Kloster Kreitz), Holzheim, Neuss: Benedictine nuns 1899-today
- Küstelberg Priory (Augustinerinnenkloster Küstelberg), Winterberg: Augustinian Canonesses 1177-1297
Read more about this topic: List Of Christian Religious Houses In North Rhine-Westphalia