The 2019–20 Big Bash League season or BBL 09 is the ninth season of the KFC Big Bash League, the professional men’s Twenty20 domestic cricket competition in Australia. The tournament will commence on 17 December 2019 and finish on 9 February 2020. Melbourne Renegades are the defending champions. The competition is 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 will be replaced by a bat flip, with “hills and flats” used instead of heads or tails.