registry office
noun [ C ] mainly UK uk/ˈredʒ.ɪ.stri ˌɒf.ɪs/ us/ˈredʒ.ɪ.stri ˌɑː.fɪs/ (also register office)
户籍登记处（负责出生、死亡和婚姻登记，并可以办理世俗结婚手续）
a place where births, deaths, and marriages are officially recorded and where you can get officially married, without a religious ceremony