Hauppauge (/ˈhɔːpɒɡ/ HOP-og) is a hamlet and census-designated place (CDP) in the towns of Islip and Smithtown in western Suffolk County, New York, on Long Island.

[6] In 1812, the Hauppauge Methodist Church that stands today was constructed on land donated by the Wheeler family.

Hauppauge gained significance as a waypoint on the King's Highway, laid out by the colonial legislature of New York in 1702.

Hauppauge was effectively split between the towns of Smithtown and Islip in 1798 with the survey of New Highway, or what is now known as Townline Road (County Route 76).

[9] The companies in the industrial park provide tax revenue to the Hauppauge school district's budget.

The current site of the Long Island Innovation Park at Hauppauge housed a radio communication facility operated first by Mackay Radio and Telegraph Company in 1936 (and owned by Clarence Mackay) and later by the ITT Corporation.

[10] The radio facility, which specialized in transmissions to and from Europe, South America, and ships at sea, closed in 1986 but is memorialized on-site by Wireless Blvd.

Carl Galioto, the head of the company's technical division, stated that it opened the office because it had difficulty hiring New York City-area recruits.

[11] Voxx International, a consumer electronics company, and Dime Community Bank are also headquartered here.