College Green (Irish: Faiche an Choláiste) is a three-sided plaza in the centre of Dublin, Ireland. On its northern side is the Bank of Ireland building, which until 1800 was Ireland's Parliament House. To its east stands Trinity College Dublin. To its south stands a series of 19th-century buildings.

Streets leading onto College Green are Dame Street to the west, Grafton Street to the south, Westmoreland Street to the north and College Street to the northeast. College Green has been used as an assembly point for major political rallies. In the mid-1990s, United States President Bill Clinton addressed a crowd during his visit to Ireland. President Barack Obama also spoke at the site in a major address during his visit in May 2011.

College Green is on Dublin's Southside, and is about 170m long. Its western end is a continuation of Dame Street. At its eastern end, facing Trinity College, it meets Westmoreland Street heading north, College Street heading northeast, and Grafton Street heading south. The Temple Bar district is to the north.

The area was once known as Hoggen Green and named after the nunnery of Blessed Virgin Mary del Hogges constructed at this location in 1156 by Diarmaid mac Murchadha. The name "Hoggen" derives from the Old Norse word haugr meaning mound, or barrow. The cemetery at College Green consisted of several burial mounds, which are thought to have contained the remains of some of the Norse kings of Dublin.

Between Church Lane and Suffolk Street, the Hiberno-Norse held their Thing, an assembly and meeting place, which was still to be seen in the 17th century. All along College Green, called Hoggen Green by the English, lay their barrows. Hoggen gave its name to the convent of St Mary de Hogges, which stood roughly where the Bank of Ireland is now and was a major landowner in the area until the Reformation. Originally laid out as a triangular green, it is now a rough trapezoid. The site has been historically used in celebration, with newly appointed Viceroys of Ireland being welcomed on the street.

Trinity College was founded on the street's east side in 1592. The west front's facade was designed by Theodore Jacobsen and added in 1751, funded partially by government duties on tobacco imported from slave plantations in the West Indies. Several public monuments stand in College Green, including a 19th-century statue facing the college of old Irish Parliament member Henry Grattan, designed by John Henry Foley.

By the time Charles Brooking published his map of Dublin in 1728, College Green had developed from a rural thoroughfare and properties had been built on both sides of the street.

A statue of King William III of England on horseback was constructed in the centre of College Green in 1701 by Grinling Gibbons. The statue was historically the site of celebrations marking the King's birthday on 4 November, with a procession through the city and a parade around the statue. These celebrations during the age of the Whig single party state were recorded by Mary Delany, who wrote that the King was "idolized here almost to superstition." After the formation of the ultra-Whig Orange Order in 1795 and the Rebellion of 1798, the statue became a target for the fervour of both sides. The statue was routinely decorated with orange ribbons and lilies, with the railings painted orange, but it was also frequently defaced, painted with pitch and there was one attempt to remove the head.