Prefecture (from the Latin Praefectura) indicates the office, seat, territorial circumscription of a Prefect. The term prefecture is also used to refer to offices analogous to prefectures.

Antiquity

It has been used most prominently to denote a somewhat self-governing body or area since the tetrarchy, when emperor Diocletian divided the Roman Empire into four districts (each divided into dioceses, grouping under a Vicarius a number of Roman provinces, listed under that article), although he maintained two pretorian prefectures as an administrative level above the also surviving dioceses (a few of which were split).

Ecclesiastic

As Canon law is strongly inspired by Roman law, it is not surprising that the Catholic Church has several offices under a prefect. That term occurs also in otherwise styled offices, such as the head of a congregation or department of the Roman Curia. Various ecclesiastical areas, too small for a diocese, are termed prefects.

French préfecture

main: Prefectures in France In France, a préfecture is the capital city of a département. As there are 100 départements in France, there are 100 préfectures in France. A préfecture de région is the capital city of a .

Brazilian equivalent of prefecture

In Brazil, the prefecture (prefeitura in Portuguese) is the City Hall, home to the Executive of a city and to the mayor's office.

Greek equivalent of prefecture

main: Prefectures of Greece Modern Greece, under its 1975 Constitution, is divided into 51 nomoi ( ) which form the units of local government. These are most commonly translated into English as prefectures.

Each nomos is headed by a prefect (nomarch), who was until recently a ministerial appointee but is nowadays elected by direct popular vote. Municipal elections in Greece are held every four years and voting for the election of nomarchs and mayors is carried out concurrently but with separate ballots.

Chinese equivalents of prefecture

main: Prefecture (China)

The ancient sense

Xian'' (县/縣)

main: County (PRC and ROC) When used in the context of Chinese history, especially China before the Tang Dynasty, the word "prefecture" is used to translate xian (县/縣). This unit of administration is translated as "county" when used in a contemporary context.

''Zhou

main: Zhou (country subdivision) In the context of Chinese history during or after the Tang Dynasty, the word "prefecture" is used to translate zhou (州), another ancient unit of administration in China.