Shirley is a hamlet in Suffolk County, New York, United States. At the 2010 census, the population of Shirley was 27,854. Shirley is the western terminus of Atlantic Crossing 1, a major submarine telecommunications cable linking the United States with the UK, Germany, and the Netherlands. Soon, the Emerald Express transatlantic communications cable will provide data connectivity between Europe and North America, landing in Shirley.

Cletus Seldin is an American professional boxer.