Gardiner is a hamlet (and a census-designated place) in Ulster County, New York, United States.

[2] According to the United States Census Bureau, the CDP has a total area of 3.8 square miles (9.9 km2).

As of the census[4] of 2000, there were 856 people, 342 households, and 234 families residing in the CDP.

There were 371 housing units at an average density of 97.0 per square mile (37.5/km2).

23.7% of all households were made up of individuals, and 6.7% had someone living alone who was 65 years of age or older.