The women's giant slalom in the 2018 FIS Alpine Skiing World Cup involved eight completed events. When the World Cup finals race scheduled in Åre, Sweden was cancelled due to high winds, Viktoria Rebensburg of Germany, who had won three races during the season and held a 92-point lead over defending champion Tessa Worley of France in the discipline standings before the finals, was crowned as discipline champion for the season.

Viktoria Rebensburg is a German retired World Cup alpine ski racer and the 2010 Olympic gold medalist in the giant slalom. Born in Tegernsee, Bavaria, she has three World Cup season titles, all in giant slalom.