The 2020–21 Biathlon IBU Cup was a multi-race tournament over a season of biathlon, organised by the International Biathlon Union.

IBU Cup was the second-rank competition in biathlon after the Biathlon World Cup.

The season started on 14 January 2021 in Arber, Germany and ended on 14 March 2021 in Obertilliach, Austria.

The defending overall champions from the 2019–20 Biathlon IBU Cup were Lucas Fratzscher from Germany and Elisabeth Högberg from Sweden.

Below is the IBU Cup calendar for the 2020–21 season.