Legal age for marriage is 18 years for both men and women
Bride and Groom may not be related by blood, marriage or adoption
Two witnesses must be present who are over 18 years old.
There's no set residency period in Croatia, but you will have to visit the registrar a couple of days before your wedding.
You can obtain a Certificate of No Impediment in your home country or at your
Embassy in Croatia, but you can only obtain a Certificate de Coutume
(Certificate of Custom and Law) at your Embassy in Croatia (this may not be
needed, depending on the type of ceremony).
Once you have received your Certificate of No Impediment it must then be taken to the Croatian Ministry of Foreign Affairs in Zagreb to have the Embassy’s signature verified. All documents below must then be submitted to the registrar no later than 30 days before the ceremony.
Passports and photocopies
Photocopies of your witnesses passports
Full birth certificates issued no more than 3 months before the marriage with an apostille stamp
Certificate of No Impediment with apostille stamp
Certificate de Coutume which shows that the marriage will be valid in the UK, confirms your passport number and states your citizenship (this may not be needed)
If you have been divorced then your first marriage certificate and the final divorce papers must be shown
If you are widowed then the death certificate of your previous spouse must be shown.
Croatian Ministry of Foreign Affairs
Trg N. Š. Zrinskog 7 -8