勒努斯（英语：Lenus），古罗马凯尔特人神祇，主要活动于高卢一带。作为战神而在凯尔特人中具有非凡意义。有关其形象的艺术作品亦广泛留存于今西欧与中欧的英国、德国等国家，影响深远。

Lenus (Ancient Greek: Ληνός) was a Celtic healing god worshipped mainly in eastern Gaul, where he was almost always identified with the Roman god Mars. He was an important god of the Treveri tribe, who had large sanctuaries at medicinal springs at Trier and the Martberg by Pommern in what is now Germany. Two dedications to him are also known from southwestern Britain (Chedworth and Caerwent). Edith Wightman characterizes him as “one of the best examples of a Teutates, or god of the people, equated with Mars—protector of the tribe in battle, but also [...] bestower of health and general good fortune” (p. 211). His sanctuary ‘Am Irminenwingert’ at Trier had a large temple, baths, smaller shrines and a theatre; that on the Martberg also included a large variety of buildings, probably including rooms for health-seeking pilgrims to stay. Despite his associations with healing, Lenus Mars is depicted classically as a warrior with Corinthian helmet in a bronze statuette from the Martberg.