Attica Prefecture (Greek: Νομὸς Ἀττικῆς) was a prefecture of Greece, first established in 1833 and disestablished for the last time in 1987. The prefecture was coextensive with the present-day Attica region.
Attica Prefecture was first established in 1833 as Attica and Boeotia Prefecture. Attica and Boeotia Prefecture was abolished in 1836 and split up into separate Attica and Boeotia prefectures, then reconstituted in 1845, and subsequently split up again into separate Attica and Boeotia prefectures in the 1899 reform; the latter reform was reversed in 1909. Attica and Boeotia Prefecture finally ceased to exist in 1943, when it was again split up into Attica and Boeotia (FEK 223Α/26-7-1943).
It was the only prefecture subdivided like this and in many contexts the sub-units were regarded as prefectures.