Dalkey Island is an island for which the nearby village of Dalkey is named. It is an uninhabited island located in the county of Dún Laoghaire-Rathdown, about 16 km (9.9 mi) south of Dublin and 3 km (1.9 mi) south of Dún Laoghaire harbour. An important site of pilgrimage for centuries, it has been known as "St Begnet's Isle" since records began. The earliest reference to 'Dalkey Island' is from c. 1782. The island had a population of 8 in 1841.

Dalkey is an affluent suburb of Dublin, and a seaside resort southeast of the city, and the town of Dún Laoghaire, in the county of Dún Laoghaire–Rathdown in the traditional County Dublin, Ireland. It was founded as a Viking settlement and became an active port during the Middle Ages. According to chronicler John Clyn (c.1286–c.1349), it was one of the ports through which the plague entered Ireland in the mid-14th century. In modern times, Dalkey has become a seaside suburb that attracts some tourist visitors.