Centereach (/ˈsɛntəritʃ/) is a hamlet and census-designated place in Suffolk County, New York, United States.

[2] The hamlet of Centereach was first called West Middle Island, but primarily became known as New Village until the early 20th century.

The name Centereach reflects the centrality of the hamlet's location on Long Island, literally meaning "center reached".

[3] The two earliest suburban developments, which began in the early 1950s, were Dawn Estates and Eastwood Village.

According to the United States Census Bureau, the CDP has a total area of 8.7 square miles (22.6 km2), all land.

[2] New York State Route 25 (Middle Country Road) passes through the community and is the primary commercial thoroughfare.