Coolock is a large suburban area, centred on a village, on Dublin city's Northside in Ireland. Coolock is crossed by the Santry River, a prominent feature in the middle of the district, with a linear park and ponds. The Coolock suburban area encompasses parts of three Dublin postal districts: Dublin 5, Dublin 13 and Dublin 17.
The civil parish of Coolock takes in the land between the Tonlegee Road (as far as Donaghmede) and the Malahide Road, as well as the lands on either side of the Malahide Road between Darndale and Artane, and the lands either side of the Oscar Traynor Road on the approach to Santry.
Coolock is also the name of the barony which accounts for most of north Dublin city, from the coast in to the Phoenix Park, and stretching north as far as to Swords.