Col de Sarenne is a mountain pass located in the Grandes Rousses massif, approximately east of Alpe d'Huez in the Isère department of France. The pass connects Alpe d'Huez with the villages of Mizoën and Le Freney-d'Oisans in the Romanche valley. The road over the pass was used on Stage 18 of the 2013 Tour de France bicycle race as this loops round to enable the cyclists to climb the Alpe d'Huez twice in the same stage.