register office 
noun
(In the UK) a local government building where civil marriages are conducted and births, marriages, and deaths are recorded with the issue of certificates.The office for national statistics and the general register office supplied copies of death certificates....
- Robin persuaded her to go through a ceremony of marriage at a register office, but Heidi thought it was merely a ceremony of betrothal.
- Gays will be able to sign an official document at a register office in front of the registrar and two witnesses, although there will not be an official ceremony.
Usage
The form register office is the official term, but registry office is the form which dominates in informal and non-official use.
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