From Longman Dictionary of Contemporary Englishregistry officeˈregistry ˌoffice noun [countable] PGORECORDa local government building in Britain where you can get married, and where births, marriages, and deaths are officially recorded
Examples from the Corpus
registry office• If you're tying the knot at a registry office, this timeless style is ideal.• They were married at a registry office and had a quiet reception.• They were also married in a registry office.• The offices, in an old registry office, are still being worked on.• The witnesses were people who worked at the registry office.• The feelings that are carried up the aisle or into the registry office are presumably countless.• The registry office couldn't marry them at such short notice and they must wait until the following day. 