What Katy Did At School

The Katy series is a set of novels by Sarah Chauncey Woolsey, writing under the pen-name of Susan Coolidge. The first in the series, What Katy Did, was published in 1872 and followed the next year by What Katy Did at School. What Katy Did Next was released in 1886. Two further novels, Clover (1888) and In the High Valley (1890), focused upon other members of the eponymous character's family. In a 1995 survey, What Katy Did was voted as one of the top 10 books for 12-year-old girls.

The series was later adapted into a TV series entitled Katy in 1962, and two films, one also called Katy in 1972 and What Katy Did in 1999.