The 1998–99 Liga Femenina de Baloncesto was the 37th edition of Spain's premier championship for women's basketball clubs.
Defending champion Celta Vigo defeated CB Islas Canarias in the play-off's final to win its fifth title.
[1] CD Ensino and Ros Casares Valencia also reached the play-offs.
On the other hand, CB Tres Cantos and Baloncesto Alcalá were relegated as the bottom teams.
[2]