Hawthorne is a hamlet and census-designated place (CDP) located in the town of Mount Pleasant in Westchester County, New York, United States.

On September 23, 1780, Major John André stopped here on his way to New York to ask directions after meeting with Benedict Arnold.

In the early 1890s, real-estate developer Louis Smadbeck began buying up the area farms to subdivide into parcels, which were sold to working- and middle-class people looking to live outside the city.

Shortly after the opening of the cancer home, the hamlet was renamed Hawthorne in Mother Mary Alphonsa's honor.

Rosary Hill Home is still operated by the Dominican Sisters of Hawthorne and is located on a hilltop on Linda Avenue.

[3] On July 12, 2006, an F2 tornado struck the hamlet, causing major damage to the California Closets Warehouse and minor injuries to three people.

[4] According to the United States Census Bureau, the CDP has a total area of 1.1 square miles (2.8 km2), all land.

Commerce Street (Route 141), the main commercial thoroughfare serving both Hawthorne and Thornwood, runs north to south, parallel to Metro-North's Harlem Line tracks.

[8] Hawthorne Cedar Knolls School with less than thirty students eligible to play varsity sports (football, basketball and baseball) boasted numerous championship teams in the varsity sports during the sixties and seventies (playing in a small school league named the Tri-State league, NY, NJ, and Conn.).