For stays of less than 90 days
During the first 3 months of your stay in Italy, as EU national, you cannot be required to apply for a residence document confirming your right to live in Italy without any conditions or formalities other than the requirement to hold a valid travel document (i.e. identity card or passport). These provisions also apply to family members accompanying or joining the Union citizen, who are not nationals of a Member State, provided that they are holders of a valid passport or an entry visa where required or a valid residence card as a family member of a Union citizen.
Non-EU citizens intending to stay in Italy for less than 90 days are not required to apply for a residence permit but must present a declaration of presence/dichiarazione di presenza within 8 days of their entry into Italy to the Police Headquarters (Questura) in the Province they are domiciled in (Potenza or Matera).
For students coming to Italy from a country that has not signed the Schengen agreement, the uniform Schengen stamp, placed on the passport during border controls, replaces the declaration of presence.
Students entering Italy transiting through a country from a country that has signed the Schengen agreement must present the declaration of presence within 8 days of their entry into Italy to the Police Headquarters (Questura) in the Province they are domiciled in (Potenza or Matera). Students must always carry a copy of the declaration of presence, as they may be asked to show it by police and public safety officers.