Taken from the legal page of DR1
Marriage requirements:
The Dominican Republic does not require you to get a marriage license. You need only to register to be married. The Oficialia del Estado Civil charges RD$50 for this. This is the first step prior to getting a marriage certificate.
Submit the following paperwork before the Oficial?a del Estado Civil for the preparation of your marriage certificate. Note that you may send photocopies in advance and bring the original with you:
Passport
Birth certificate
Single status affidavit translated by an official translator into Spanish
Divorce certificate translated into Spanish by an official translator, if applicable
(Legal transcripts of the birth certificates, single status affidavit and divorce act need to be prepared at the Dominican consulate in the country where the documents were issued.)
You will also need two witnesses. If they are foreigners, they will need to have passports as identification. If they are Dominicans, "cedulas" are sufficient.
II. After the marriage:
You will be given a document that proves the wedding took place. You then need to request a marriage certificate from the “Oficial de Estado Civil” (City Clerk) that married you.
Marriage certificate validity abroad
The document issued by “Oficial de Estado Civil” (City Clerk) is a valid marriage certificate.
DR1 - Legal