Nilsson won three silver medals at the 2015 World Championships in Falun; On 19 February in the individual sprint, on 22 February in the team sprint (with Ida Ingemarsdotter), and on 26 February in the 4 × 5 km relay (with Sofia Bleckur, Charlotte Kalla, and Maria Rydqvist). Nilsson won the Under-23 World Cup title for the 2014–2015 season and finished fourth in the Sprint World Cup.