The Tech (French: [tɛk] ⓘ; Catalan: Tec [ˈtɛk]) is a river in southern France, very close to the French-Spanish border.

It runs through a valley in the Pyrénées-Orientales, in the former Roussillon, and is 84.5 kilometres (52.5 mi) long.

[1] Its source is the Parcigoule Valley, elevation 2,500 metres (8,200 ft), and it feeds the Mediterranean Sea.

The Tech flows through 25 different towns, from its source to the sea: Prats-de-Mollo-la-Preste, Serralongue, Le Tech, Saint-Laurent-de-Cerdans, Montferrer, Corsavy, Arles-sur-Tech, Montbolo, Amélie-les-Bains-Palalda, Reynès, Céret, Saint-Jean-Pla-de-Corts, Maureillas-las-Illas, Le Boulou, Tresserre, Saint-Génis-des-Fontaines, Montesquieu-des-Albères, Banyuls-dels-Aspres, Villelongue-dels-Monts, Brouilla, Ortaffa, Palau-del-Vidre, Elne and Argelès-sur-Mer.

It flows into the Mediterranean Sea between Saint-Cyprien and Argelès-sur-Mer, southeast of Perpignan.