Coordinates: 55°56′58″N 4°45′51″W / 55.94957°N 4.76415°W / 55.94957; -4.76415

Greenock ( listen (help·info); Scottish Gaelic: Grianaig, pronounced [kɾʲiənɛkʲ]) is a town and administrative centre in the Inverclyde council area in United Kingdom, and a former burgh within the historic county of Renfrewshire, located in the west central Lowlands of Scotland. It forms part of a contiguous urban area with Gourock to the west and Port Glasgow to the east.

Greenock's population was recorded as being 45,467 in the 2001 census, a decrease from about 78,000 in 1966. It lies on the south bank of the Clyde at the "Tail of the Bank" where the River Clyde expands into the Firth of Clyde.

The origin of the town's name is uncertain. It is generally accepted, however, that the town is named after the Gaelic "Grianaig" meaning a sunny place. The suggestion that the town's name comes from the words Green Oak is merely folk etymology, but the image has been taken as a logo for the town's main shopping centre, The Oak Mall and was once emblazoned on the local Co-operative Society emblem. The myth that 'Greenock' derives from 'Green Oak' is also perpetrated in a local song (The Green Oak Tree). Significantly, no green oak appears on the town's coat of arms which features three sugar caskets, a sailing ship in full sail and three herring above the motto God Speed Greenock.