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- Isaac N. Carleton, Educator and a President of the American Institute of Instruction (graduated 1855)
- Norman Cahners, Publisher and athlete, qualified for 1936 Olympics, but boycotted because games were to be held in Nazi Germany.
- Lincoln Chafee, former Senator of Rhode Island (graduated 1971)
- Otis Chandler, former publisher of the Los Angeles Times (graduated 1946)
- Thomas Chapin (1957–1998), jazz saxophonist
- Sarah Chayes, expert in religious studies and former Kandahar field director (graduated 1980)
- George Church, Professor of Genetics, Harvard Medical School. Pioneer of human genetics (graduated 1972)
- Sloane Citron, magazine publisher (graduated 1974)
- Christian Clemenson, an Emmy Award-winning American film and television actor (graduated 1976)
- Harlan Cleveland, U.S. Ambassador NATO under President Lyndon B. Johnson (graduated 1934)
- Raymond Charles Clevenger III, judge for the U.S. Court of Appeals for the Federal Circuit (graduated 1955)
- William Sloane Coffin, Reverend and Peace Activist (graduated 1942)
- Donald B. Cole, Instructor in History and Dean, Phillips Exeter Academy (graduated 1940)
- Frank Converse, actor (graduated 1956)
- Michael Copley, musician
- Joseph Cornell, sculptor (graduated 1921)
- Harry M. Cornell, Jr., CEO of Leggett & Platt, Inc. (Postgraduate year)
- Justin Cronin, author (graduated 1980)
- Bill Cunliffe, Grammy Award winning composer, arranger, jazz pianist, (graduated 1974)
- Peter Currie, Netscape executive, investor, Charter Trustee (graduated 1974)
Read more about this topic: List Of Phillips Academy Alumni