洛伊克是瑞士的城镇，位于该国西南部，由瓦莱州负责管辖，面积44.16平方公里，海拔高度731米，2010年人口3,381，其中八成居民信奉罗马天主教。

Leuk (French:Loèche-Ville) is a municipality in the district of Leuk in the canton of Valais in Switzerland. On 1 January 2013 the former municipality of Erschmatt merged into the municipality of Leuk.

Since it controls access to the Gemmi Pass, it had some importance from the time of Roman Raetia. The Leukerbad thermal baths are just North of Leuk, towards the pass. It is the capital of the Leuk district of the Valais.