Marrying in Italy, made simple!!!
MARRIAGE OF AMERICAN CITIZENS IN ITALY
General guidelines:
American citizens wishing to be married in Italy must appear with two
witnesses and make a declaration of their intention to marry before the
"Ufficiale dello Stato Civile" (Civil Registrar) of the city or town in which
the marriage is to take place. At the time of making their declaration, the
couple must present all the required documents (see below).
Following the declaration, it is usually necessary for banns
(Pubblicazioni di Matrimonio) to be posted at the local Comune (City
Hall) for two consecutive Sundays before the marriage is celebrated.
However, banns are usually waived by the "Ufficiale dello Stato Civile"  
if neither party to the marriage is an Italian and neither is residing in
Italy.
On the fourth day following the second Sunday on which the banns are
posted or any time after the banns have been waived, the couple may be
married, either in a civil or a religious ceremony. A religious ceremony is performed by a clergyman and the clergyman will register the marriage
with the "Ufficiale dello Stato Civile" to validate it. Because of certain
special requirements applicable to marriage performed by non-Roman
Catholic clergyman, the latter usually insists on a prior civil ceremony
before performing a religious ceremony, this will ensure the legality of
the marriage. Details will be provided by the non-Roman Catholic
clergyman.

The following documents must be presented to the "Ufficiale dello
Stato Civile" when making a declaration of intention to marry:
1.  Certified copy of "long form" birth certificate complete with the
"Apostille" seal affixed by the appropriate Secretary of State. The
document must be translated in Italian;
2.   Evidence of termination of any previous marriage (final decree of
divorce or annulment decree or death certificate of the previous spouse),
translated in Italian and legalized with "Apostille";
3.  If applicable, sworn statement of consent of the marriage by the
parents or legal guardian if the American citizen is under legal age;
4.  Declaration by a lawyer or a public notary stating that there are no
obstacles under American law to the marriage. It is recommended that
this statement be obtained from a diplomatic office of the United States
in Italy (US Consulate);
5.  An affidavit (Atto Notorio), sworn by two witnesses (not relatives or
parents of the parties) before either an Italian Consular Office outside of
Italy, or in Italy at a "Pretura" or before a mayor, town clerk or notary
public, stating that the American citizen is free to contract marriage. Any
American going to Italy to be married is urged to obtain this declaration
in the US before leaving.

Please note that it is strongly recommended that all the documents that
need an Italian translation, should be brought to the Italian Consulate
with the translation to have it certified as a true and correct translation of
the English version. This can be done during the same morning when
signing the "Atto Notorio".
Italian Marriage