Cornelia Cochrane Churchill Guest (born November 28, 1963) is a New York socialite, author, actress, and the Debutante of the Decade for the 1980s of the International Debutante Ball in New York City. She is a vegan, and known for her advocacy of animal rights.

Cornelia Cochrane Churchill Guest was born on November 28, 1963, in New York City, New York. Cornelia Guest is the daughter of the British polo champion Winston Guest (1906–1982) and socialite Lucy "C.Z.