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?

Article 156 paragraph 2 of the Code of civil procedure gives the definition of an authentic instrument (see answer question 1.) The notarial act is further defined in the Notarial Code. The Civil Code refers in some articles to a notarial act, meaning that only the authentic act signed by a notary (a notarial act) is accepted (see for example the mortgage act as mentioned in art. 3:260 Civil Code.)
Civil registrars, judicial officers and courts can also draw up authentic instruments in the Netherlands, regulated by the Civil Code and the Code of civil procedure.