The 2018–19 Australian Baseball League season was the ninth year Australian Baseball League (ABL) season, and was held from 15 November 2018 to 2 February 2019.
It was the first season that it was played with eight teams, as the league expanded for the first time.
The Brisbane Bandits won the championship for the fourth consecutive season.
With the addition of the Auckland Tuatara and Geelong-Korea as expansion teams, the competition was split into a 'Northeast' and 'Southwest' division.
A new playoff structure was announced 29 August 2018 with the addition of a single wild card game between the fourth and fifth seeds prior to two rounds of best-of-three finals series.