Arles-sur-Tech (French pronunciation: [aʁl syʁ tɛk] ⓘ, literally Arles on Tech; Catalan: Arles de Tec) is a commune in the Pyrénées-Orientales department in southern France.

[3] Arles-sur-Tech is situated in the southernmost valley in mainland France before Spain, the Vallespir, through which the 84 km (52 mi) long river "Tech" flows.

This small town is surrounded by the eastern Pyrenees which dominate the skyline around Arles-sur-Tech.

The town sits on the only main road which passes through the valley, the D 115, making it accessible from Spain in the west and the plane of Roussillon and Perpignan in the east.

At the end of the Spanish Civil War Arles-sur-Tech was the site of a camp housing Republican escapees from Spain.