On December 22, 2018, she won the slalom in Courchevel, France, and became the youngest skier, female or male, to win 50 World Cup ski races at 23 years and nine months. With that race, she also equaled the record of the Austrian Marlies Schild for the most wins in women's slalom – 35, and put herself in joint seventh place in all-time World Cup victories with Alberto Tomba of Italy. One week later, she took another World Cup slalom win in Semmering, Austria, becoming the first alpine skier to take 15 World Cup wins in a single calendar year, moving ahead of Marcel Hirscher, who had taken 14 wins in 2018: both had broken the old record of 13 wins which had been set by Ingemar Stenmark in 1979. The race was also her 36th World Cup slalom win, breaking Schild's record: Shiffrin subsequently described Schild as "my biggest idol beside Bode Miller". At the start of February 2019, shortly before the 2019 Alpine World Ski Championships, Shiffrin moved into third place on the list of female skiers with the most World Cup race wins at a meeting in Maribor, tying with Vlhová for the win in giant slalom to put her equal with Vreni Schneider on 55 wins before winning a slalom the following day to overtake the Swiss skier. At the World Championships, Shiffrin won the gold medal in the super-G before taking a bronze in the giant slalom in windy, changeable conditions, finishing behind Vlhová and Viktoria Rebensburg. She went on to secure a second gold in the slalom, becoming the first alpine skier to win four consecutive World Championships in the same discipline, despite suffering from a lung infection on the day of the race. Following the Worlds, in March 2019, Shiffrin became the first alpine skier to take 15 World Cup wins in a season when she took victory in slalom in Špindlerův Mlýn, breaking the record she had previously held jointly with Vreni Schneider. At the World Cup finals in Soldeu, Shiffrin started her campaign by clinching the super-G crystal globe, finishing fourth in the final race to take her tenth World Cup title and her first in a speed discipline, having already built an unassailable lead to secure the overall and slalom titles earlier in the season. She became the first skier to win World Cups in a technical and a speed