Nesconset is a hamlet and census-designated place (CDP) located within the Town of Smithtown, in Suffolk County, Long Island, New York, United States.

[2] At the time of colonization, the area that would become Nesconset was likely a seasonal hunting ground visited by both eastern Algonquin-speaking and western Munsee-speaking people who lived in clans.

[3] After Smithtown passed a law in 1768 forbidding Algonquin-style living, Nesconset remained largely a deserted stretch of pine barrens.

By the turn of the 19th century, a sparse population of farmers and seasonal residents lived along Middle Country Road and Lake Ronkonkoma.

[4] In 1904, brothers and French immigrants Louis and Clemen Vion came to the Pine Barrens of southeastern Smithtown from Manhattan on numerous occasions as sportsmen.

By 1910, the brothers felled a line of trees off of Gibbs Pond Road immediately south of modern-day New York State Route 347 to create Midwood Avenue.

The brothers decided to name the newly established settlement after Smithtown's local historical figure, Sachem Nasseconsett,[6] who deeded the Nissequogue tribe's land to Richard Smith.

By 1930, Nesconset had a population of 50 people along Lake Avenue and spread along Smithtown Boulevard and Gibbs Pond Road.

The construction of present-day New York State Route 347 in the 1950s opened the southeast corner of Smithtown to rapid suburban development by bisecting the small center of the hamlet.

[9] The statistical area defined as Nesconset was expanded in the early 1970s to include a portion of what was Lake Ronkonkoma, New York.