Fingal (English: /ˈfɪŋɡɔːl/ FING-gawl; from Irish Fine Gall, meaning 'foreign tribe') is a county in Ireland. It is in the province of Leinster and is part of the Eastern and Midland Region. It is one of three successor counties to County Dublin, which was disestablished for administrative purposes in 1994. Its name is derived from the medieval territory of Scandinavian foreigners (Irish: gaill) that settled in the area. Fingal County Council is the local authority for the county. In 2022 the population of the county was 330,506, making it the second most populated council in Dublin and the third most populous county in the state.

Fingal is one of three counties into which County Dublin was divided in 1994. Swords is the county town. The other large urban centre is Blanchardstown. Smaller towns include Balbriggan and Malahide. Suburban villages with extensive housing include Baldoyle, Castleknock, Howth (and Sutton), Lusk, Donabate,Portmarnock, Skerries. Small rural settlements exist in the northern and western parts of the county. The motto of the arms of Fingal reads Irish: Flúirse Talaimh is Mara meaning "Abundance of Land and Sea". The motto reflects the strong farming and fishing ties historically associated with the area. It also features a Viking longboat, which represents the arrival of the Norse in Fingal, where they became integrated with the existing Irish. Fingal is bordered by County Meath to the north, by Kildare to the west and by Dublin city to the south. At the Strawberry Beds, the River Liffey separates the county from South Dublin.

Fingal varies enormously in character, from densely populated suburban areas of the contiguous Dublin metropolitan region to remote rural villages and small, unpopulated agricultural townlands.

The northernmost parts of Ballymun, Santry and Finglas are also part of Fingal. Clonee, part of County Meath, has housing estates in its hinterland that merge into the estates of Ongar in western Fingal.

The former county of Dublin was divided into nine baronies. The part of Fingal within County Dublin was in later centuries subdivided into the following administrative baronies: Balrothery West, Balrothery East, Nethercross, Castleknock and Coolock. While baronies continue to be officially defined units, they are no longer used for many administrative purposes. The last boundary change of a barony in Dublin was in 1842, when the barony of Balrothery was divided into Balrothery East and Balrothery West. Their official status is illustrated by Placenames Orders made since 2003, where official Irish names of baronies are listed under "Administrative units". The boundaries of Fingal do not respect the boundaries of the baronies. As a result, only three baronies are entirely contained in the county: Balrothery East, Balrothery West, and Nethercross. Parts of three baronies are also contained in the county: Castleknock, Coolock, and Newcastle.

In the case of Castleknock, most civil parishes of the barony are under the jurisdiction of Fingal County Council. Some of the eastern parishes are under the jurisdiction of Dublin City Council. The core of the civil parish of Finglas lies within Dublin City. There are two substantial exclaves of the parish proper that are located in Fingal.

In the case of Coolock, most civil parishes of the barony are in Dublin City. The parishes listed in the table below are located in Fingal.

In the case of Newcastle, most of the barony is situated south of the River Liffey and so is under the jurisdiction of South Dublin County Council. Six townlands are located north of the Liffey in the civil parish of Leixlip. Listed in the table below, they are part of Fingal.