The 1990–91 Biathlon World Cup was a multi-race tournament over a season of biathlon, organised by the UIPMB (Union Internationale de Pentathlon Moderne et Biathlon).

The season started on 13 December 1990 in Albertville, France, and ended on 17 March 1991 in Canmore, Canada.

It was the 14th season of the Biathlon World Cup.

Below is the World Cup calendar for the 1990–91 season.

Following notable biathletes retired after the 1990–91 season: