| Cas-en-Bas | |
| Pushpin Map: | Saint Lucia |
| Pushpin Map Caption: | Location in Saint Lucia |
| Subdivision Type: | Country |
| Subdivision Name: | Saint Lucia |
| Subdivision Type1: | Quarter |
| Subdivision Name1: | Gros Islet |
Cas-en-Bas is a settlement in Saint Lucia; it is located in the northern part of the island.