Meta, which is led by US billionaire Mark Zuckerberg, will be called to testify before a lower house committee.
The investigation stems from international research that found Meta had used a hidden mechanism to track the web activity of Android device users, Sanchez's office said.
Spain's parliament will investigate Meta for possible privacy violations of its Facebook and Instagram users, Spanish Prime Minister Pedro Sanchez said on Wednesday.
"In Spain, the law is above any algorithm or any large technology platform. And anyone who violates our rights will pay the consequences," Sanchez said in a statement.
