The Selle (French pronunciation: [sɛl] ; also spelt Celle in the Oise) is a river of Hauts-de-France, France. It is 39.2 km (24.4 mi) long. Rising at Catheux, just north of Crèvecœur-le-Grand, Oise, it flows past Conty, Saleux, Salouël and Pont-de-Metz before joining the Somme at Amiens.

In many places along its course, the river widens to form or fill lakes, much appreciated by anglers and gravel extractors. Several water-powered mills can still be seen including a paper-mill at Prouzel. Brown trout thrive in the clear waters of the river.

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  The watermill between Fontaine-Bonneleau and Croissy-sur-Celle
• 
  The Mill at Croissy-sur-Celle

• Page about the Selle on the website of the Canton de Conty (in French)
• Banque Hydro - Station E6426010 - La Selle à Plachy-Buyon (option Synthèse) (in French)