Shrub Oak is an unincorporated hamlet and census-designated place (CDP) located in the town of Yorktown in Westchester County, New York, United States.

At the 2000 census there were 1,812 people, 601 households, and 495 families residing in the hamlet (of Yorktown).

[6] The writer Clifford A. Pickover has used Shrub Oak as a backdrop in several of his books, including Sex, Drugs, Einstein and Elves, "Liquid Earth (Neoreality Series)" and A Beginner's Guide to Immortality.

The stamp collector, philatelic writer and dealer, Herman Herst lived in Shrub Oak, which he mentions in many of his writings.

T. C. Boyle uses Shrub Oak as setting for his short story "All Shook Up".