Is sex selection illegal in Spain?

Yes. Sex selection is banned in Spain. Picking a baby's sex is a 'very serious' offence under the IVF law.

Party to the Council of Europe Oviedo Convention (ETS 164, in force 1 Dec 1999). Article 14 forbids using medically assisted procreation to choose a future child's sex, except to avoid a serious hereditary sex-related disease. A ratified treaty in force binds the state; Spain's Ley 14/2006 on assisted reproduction lists sex selection for non-therapeutic purposes as a very serious infringement (art. 26), with the sex-linked disease exception.

Source: Ley 14/2006 art. 26; Oviedo

Banned (50)Restricted (9)Allowed

Spain is one of 50 countries where sex selection is banned, and 9 more restrict it.
Its neighbours: banned in 2 of 2 (France and Portugal).
In Europe: banned in 34 of 39 countries.