Alta Rockefeller Prentice (April 12, 1871 –June 21, 1962) was the third daughter of oil tycoon John D. Rockefeller (1839–1937) and his wife Laura Celestia "Cettie" Spelman (1839–1915). Alta married ColonelEzra Parmalee Prentice (July 29, 1863–1955), a prominent Chicago attorney, son of Sartell Prentice and wife Jemima Parmalee, in 1901. Alta and Ezra had three children: John Rockefeller Prentice (1902–1972), Mary Adeline Prentice Gilbert (1907-1981), and Spelman Prentice (1911–2000).

She founded Alta House (c. 1900), a settlement house in Little Italy in Cleveland, Ohio, which is named in her honor.

In 1910, Alta and Ezra bought 1,400 acres (5.7 km²) of land near Williamstown, Massachusetts. Elm Tree House, the Prentices' 72-room summer home on Mount Hope Farm, was completed in 1928. In the 1930s and 1940s, several geneticists were employed by Ezra to develop more profitable farm animals, particularly cattle andpoultry. At that time, Mount Hope Farm was one of the most outstanding experimental farms in the United States.

Alta died in 1962 at the age of 91. Her property was willed to New York's Lenox Hill Hospital. Shortly thereafter, Elm Tree House was purchased by its current owner, Williams College.