2018–19 Big Bash League season
| Dates | 19 December 2018 – 17 February 2019 |
|---|---|
| Administrator(s) | Cricket Australia |
| Cricket format | Twenty20 |
| Tournament format(s) | Double round robin and knockout |
| Champions | Melbourne Renegades (1st title) |
| Participants | 8 |
| Matches | 59 |
| Attendance | 1,212,596 (20,552 per match) |
| Player of the series | D'Arcy Short (Hobart Hurricanes) |
| Most runs | D'Arcy Short (Hobart Hurricanes) (637) |
| Most wickets | Kane Richardson (Melbourne Renegades) (24) |
| Official website | bigbash.com.au |
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 playing each other twice at both a home venue and away venue. 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 season saw Cameron Bancroft's return to professional cricket, following his involvement in the ball-tampering scandal in March 2018.
The title was won by Melbourne Renegades, who defeated Melbourne Stars at the Marvel Stadium.