| Clarence | |
| Pushpin Map: | France#France Hauts-de-France |
| Mouth Location: | Lys |
| Mouth Coordinates: | 50.6378°N 2.6458°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | France |
| Length: | 33km (21miles) |
The Clarence is a river in northern France whose 33km (21miles) course crosses the department of Pas-de-Calais.
Its source is near the village of Sains-lès-Pernes. It flows through the communes of Sachin, Pernes, Calonne-Ricouart, Calonne-sur-la-Lys and Gonnehem, finally joining the Lys near Merville.
It has two tributaries, the Nave and the Grand Nocq.
(All French language)