Mary Anissa Jones /əˈniːsə/[a] (March 11, 1958 – August 28, 1976) was an American child actress known for her role as Buffy Davis on the CBS sitcom Family Affair, which ran from 1966 to 1971.

Two years later, 8-year-old Jones, who was small for her age, was cast as 6-year-old Ava Elizabeth "Buffy" Patterson-Davis on the CBS sitcom Family Affair (1966).

In the sitcom, Buffy, her twin brother Jody (Johnny Whitaker), and older sister Cissy (Kathy Garver) are sent to live with their Uncle Bill (Brian Keith) and his valet Mr. French (Sebastian Cabot) a year after the children's parents die in a car accident[8] (the DVD collection notes mistakenly state "plane accident").

In 1969, at the height of her juvenile pop cultural celebrity and of Family Affair's television ratings success, Jones made her only film appearance with a small role in The Trouble with Girls, which starred Elvis Presley.

Shortly before noon on August 28, 1976, after partying in the beach town of Oceanside, California, with her new boyfriend and others the night before, Jones, 18, was found dead in an upstairs bedroom of a house belonging to the father of a 14-year-old friend.

A KABC local news team visited his office and found it filled with young people, some of whom had been waiting over three hours to be seen by Moshos.