The 2018–19 Biathlon World Cup (BWC) was a multi-race series over a season of biathlon, organised by the International Biathlon Union.

The season started on 2 December 2018 in Pokljuka, Slovenia and ended on 24 March 2019 in Oslo Holmenkollen, Norway.

The defending overall champions from the 2017–18 Biathlon World Cup were Martin Fourcade of France and Kaisa Mäkäräinen of Finland.

Below is the IBU World Cup calendar for the 2018–19 season.

The following notable biathletes retired during or after the 2018–19 season: