Marin-Epagnier is a former municipality in the district of Neuchâtel in the Swiss canton of Neuchâtel. In 1888, the formerly independent municipality merged with Epagnier and Marin to form Marin-Epagnier. On 1 January 2009, the former municipalities of Marin-Epagnier and Thielle-Wavre joined together and became the new municipality of La Tène.

It lies at the northeastern tip of Lake Neuchâtel close to Biel, at the boundary between French- and German-speaking regions, and at a knot of highways.

The Iron Age archaeological site of La Tène is within Marin-Epagnier's communal boundaries. (See also La Tène culture.) La Tène is a village at the eastern end of the Lake Neuchâtel (Lac de Neuchâtel), a lake in Switzerland. La Tène has a sandy beach, unique in Switzerland.