The 2017–18 Liga Femenina de Baloncesto, also known as Liga Dia for sponsorship reasons, is the 55th season of the Spanish basketball women's league.

It started on 30 September 2017 with the first round of the regular season and ended in April 2018 with the final.

A total of 14 teams contest the league, including 12 sides from the 2016–17 season and two promoted from the 2016–17 Liga Femenina 2.

[1] The table lists the positions of teams after completion of each round.