North Castle is a town in Westchester County, New York, United States.

North Castle has three distinct geographical areas, each taking the form of a hamlet.

[7] Due to its proximity to Manhattan and its idyllic setting, a number of major companies call Armonk home.

The American headquarters of Swiss Re is located in Armonk on a 127-acre (51 ha) site overlooking the Kensico Reservoir.

[15] According to North Castle's 2023 Annual Comprehensive Financial Report,[16] the top employers in the city are: