East Patchogue (, PATCH-awg) is a census-designated place (CDP) in the Town of Brookhaven in Suffolk County, on the South Shore of Long Island, in New York, United States. The population was 22,469 at the 2010 census. The CDP is a proximate representation of the East Patchogue hamlet used for statistical purposes of the Census Bureau.

Patchogue has historically been a major shopping and commerce hub of Suffolk County. “Patchogue” in the narrow wisdom is an incorporated village considering narrow limits, only virtually a mile and a half wide. East Patchogue includes the eastern ration of Patchogue in the wider sense, as well as the area east of that but nevertheless west of the incorporated village of Bellport. This double meaning of “East Patchogue” is reflected in the naming of New York State Route 27A: It is called “East Main Street” in the western part of East Patchogue, and “Montauk Highway” (as it typically is outdoor of villages) in the eastern portion. The Patchogue side of East Patchogue is in the Patchogue-Medford School District, while the Bellport side is in the South Country Central School District, and its high-school students attend Bellport High School.

The area around County Road 80 in the western ration of East Patchogue was with commonly regarded as the hamlet of Hagerman. In New York, a hamlet has no ascribed boundaries or executive and refers unaccompanied to a named, settled area. With suburban growth, Hagerman is no longer sure from its surroundings, and the herald has fallen into disuse, especially past the removal of the Hagerman station upon the Long Island Rail Road. There nevertheless exists the Hagerman ember district.

Prior to its closure, the East Patchogue herald office was located at 1415 Montauk Highway.