1. In your legal system, are there acts which fall within the notion of an authentic instrument as defined in the European Union regulations?<br>[‘authentic instrument’ means a document which has been formally drawn up or registered as an authentic instrument in a Member State and the authenticity of which: <br>(I) relates to the signature and the content of the authentic instrument; and <br>(II) has been established by a public authority or other authority empowered for that purpose by the Member State of origin.]

Yes.

If so, what are they? Are these only notarial acts or also acts of other authorities?

According to Article 1367 of the Civil Code, when the signature is affixed by a public office-holder, it confers authenticity to the act.
Article 1369 of the Civil Code defines an authentic instrument as an instrument which has been received, with the required formalities, by a public office-holder having competence and capacity to act. Finally, Article 1371 of the Civil Code provides that the authentic instrument is proof of what the public office holder claims to have personally accomplished or established, until it is recorded as a forgery.
These are therefore documents issued by notaries or judicial officers, but also by courts, mayors, civil registrars, etc.