Cork (Irish: Corcaigh ) is the second largest city in the Republic of Ireland and the island of Ireland's third most populous city after Dublin and Belfast. It is the principal city and administrative centre of County Cork and the largest city in the province of Munster. The city has a population of 119,143, while the addition of the suburban areas contained in Cork County brings this total to 190,384. Metropolitan Cork has a population of approximately 274,000, while the Greater Cork area is about 380,000.

The city's name is derived from the Irish word corcach , meaning "marshy place", referring to its situation on the River Lee. Cork has a reputation for rebelliousness dating back to the town's support of the English pretender Perkin Warbeck in 1491 following the Wars of the Roses, and as a result of this Cork County has the nickname of "the Rebel County", and Corkonians often refer to Cork as the "real capital of Ireland" and themselves as "Rebels".

The River Lee flows through the city, an island in the river forming the main part of the city centre just before the Lee flows into Lough Mahon and then to Cork Harbour, the world's second largest natural harbour, after Sydney Harbour, Australia. The city is a major Irish seaport — with quays and docks sited along the broad waterway of the Lee on the city's East side. Cork is one of the three constituent cities in the Cork-Limerick-Galway corridor with a population of 1 million people.