| Mandel | |
| Map: | Mandel-map.jpg |
| Source1 Location: | Passendale |
| Mouth Location: | Leie River, near Waregem |
| Mouth Coordinates: | 50.9171°N 3.4214°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Belgium |
| Length: | 40km (30miles) |
The Mandel is a 40km (30miles) long river in the Belgian province of West Flanders, left tributary of the Leie (Lys). Its source is located in Passendale. It flows through Roeselare and Ingelmunster, and into the Leie near Waregem.