The 2018–19 Women's Big Bash League season or WBBL|04 was the fourth season of the Women's Big Bash League (WBBL), the semi-professional women's Twenty20 domestic cricket competition in Australia. The tournament ran from 1 December 2018 to 26 January 2019. Double-defending champions, the Sydney Sixers, ended the regular season on top of the ladder, while captain Ellyse Perry broke the scoring record for a sole WBBL campaign and was named Player of the Tournament.