A day after locking up her second straight World Cup overall championship, the American secured her fifth season title in the slalom.
The Olympic champion finished third in a giant slalom race Friday, which was enough to secure the top spot overall.
Only Swiss Vreni Schneider won more World Cup slalom season titles (six) than Shiffrin's five.
Shiffrin has enjoyed a dominant season, topping the World Cup podium 11 times, although her one gold at the Olympics was less than many expected.
In the men's downhill in Kvitfjell, Beat Feuz finished second behind Thomas Dressen to stretch his lead over Aksel Lund Svindal to 60 points. Lindsey Vonn, who did not race this weekend but will be in Are, holds the record of 81 wins.
Mikaela Shiffrin (Eagle-Vail, Colo.) won her fifth World Cup slalom title following her 42nd FIS Ski World Cup victory Saturday in Ofterschwang, Germany.
Since 2013, the only time she failed to win the slalom title was in 2016 when she missed two months with a knee injury.
Battling spring snow conditions and light rain, Shiffrin won the first run, then unseated second run leader Wendy Holdener of Switzerland by 0.09-seconds for the victory.
"For sure I have a big lead", Shiffrin said. Holdener finished second in slalom, followed by Sweden's Frida Hansdotter.
"It was a really good fight", said Shiffrin, who celebrates her 23rd birthday March 13.
The season-ending World Cup finals are next week in Are, Sweden. Her last race was at age 26. "The best thing for me now is to have the crystal globe already locked in".
However, she failed to win a race after triumphing at a night slalom in Flachau, Austria, on January 9.