The 2018–19 Liga Femenina de Baloncesto, also known as Liga Dia for sponsorship reasons, is the 56th season of the Spanish basketball women's league. Regular season will start on 13 October 2018 with the first matchday of the regular season and it will end on 7 April 2019 with the 26th matchday. The playoffs (quarter-finals, semi-finals and final) will be held between 10 April and 5/9 May 2019.