Halcottsville is a hamlet in the town of Middletown, Delaware County, New York, United States, on the south shore of Wawaka Lake.

It was named for John Halcott (1758-1831), a Revolutionary War soldier from Delaware County.

[2] Halcottsville is located on the East Branch Delaware River and New York State Route 30 5.6 miles (9.0 km) northeast of Margaretville.

[3] The hamlet has a stop on the excursion Delaware & Ulster Railroad which originates in nearby Arkville and extends north to the village of Roxbury.

The Kelly Round Barn and Old School Baptist Church of Halcottsville are listed on the National Register of Historic Places.