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.