Lemaitre, after consulting with his coach, opted out of competing in the 100 m in the 2012 London Olympics. Lemaitre would thus only participate in the 200 m, in which he was ranked fourth that year, and the 4 × 100 m relay. His coach, Pierre Carraz, said: "In the results over 100m, Christophe is only ranked 10th among those who have entered. Over 200m, we can hope for a medal." Lemaitre finished sixth in the 200 m final in a time of 20.19 s. After the final, he said, "I started very well. And then I still had this problem at the bend. I did my best, but it was too difficult. I finished sixth. There is not much to say. For me, it was not the final I was hoping for." In the 4 × 100 m relay final, Lemaitre won his first Olympic medal, with his team taking the bronze behind Jamaica (gold) and Trinidad and Tobago (silver).