2017–18 Segunda División (women)

The 2017–18 Segunda División Femenina de Fútbol was the 2017–18 edition of the Spanish women's football second-tier league.

Competition format
The Segunda División was divided into seven regional groups. Each group played their season as home and away round-robin format. At the end of the season, the lowest three teams from each regional group (except Group 6) were relegated to regional leagues. The seven group champions (for group 6, the winner of the Canarian final) qualified for the promotion playoffs.

In the promotion playoffs, the seven teams were divided by draw into two groups: one of four teams and other one of three. The group of four teams played a double-leg knockout format, while the group of three teams played with a double-legged round-robin format. The two group winners promoted to the Primera División.

Canarian final
The winner of the Canarian final will qualify to the promotion stage.