The 2018–19 Big Bash League season or BBL|08 was the eighth season of the KFC Big Bash League, the professional men's Twenty20 domestic cricket competition in Australia. The tournament started on 19 December 2018. Adelaide Strikers were the defending champions. The competition was extended to a full home and away season for the first time, with each team to play each other twice at both a home venue and away venue. This consists of 56 regular season matches, two semi-final fixtures and the final. For this season of the tournament, the toss was replaced by a bat flip, with "roofs and flats" used instead of heads or tails.

The Big Bash League is an Australian men's professional club Twenty20 cricket league, which was established in 2011 by Cricket Australia. The Big Bash League replaced the previous competition, the KFC Twenty20 Big Bash, and features eight city-based franchises instead of the six state teams which had participated previously. The competition has been sponsored by fast food-chicken outlet KFC since its inception. It was in 2016/17 one of the two T20 cricket leagues, alongside the Indian Premier League, to feature amongst the top ten domestic sport leagues in average attendance. The winner of BBL 13 (2023/2024) was the Brisbane Heat, who beat the Sydney Sixers by 54 runs in the final.