Lefèvre also won fourteen medals at the ICF Canoe Slalom World Championships with seven golds (C1: 2014, K1: 2002, 2003; C2 team: 2010, 2011; K1 team: 2005, 2006), five silvers (C2: 2010, 2011; K1: 2005, K1 team: 2010, 2011), and two bronzes (K1 team: 2002, K1: 2011).