The following is a list of notable past students of Phillips Academy (also known as Phillips Andover and Andover) and of the former Abbot Academy (Phillips became coeducational in 1973 by merging with its sister school).
C
- Norman Cahners, publisher and athlete; qualified for 1936 Olympics but boycotted because games were held in Nazi Germany
- Jonathan G. Callahan, former Wisconsin assemblyman
- Johnson N. Camden Jr., former United States Senator from Kentucky
- Steven Cantor, film director and producer; STEP, Dancer, Chasing Tyson, Between Me and My Mind
- Isaac N. Carleton, educator and a president of the American Institute of Instruction (graduated 1855)
- Lincoln Chafee, former Rhode Island senator (graduated 1971)
- Otis Chandler, former publisher of the Los Angeles Times (graduated 1946)
- Chang Hee-jin, South Korean Olympic swimmer (graduated 2005)
- Thomas Chapin, jazz saxophonist (graduated 1975)
- Sarah Chayes, expert in religious studies and former Kandahar field director (graduated 1980)
Maro Chermayeff, Emmy and Peabody award-winning documentary filmmaker and Founder and Chairman of the MFA program in Social Documentary at SVA NYC /The School of Visual Arts (graduated 1980)
- Susan Chira, editor, The New York Times (graduated 1976)
- Shouson Chow, Hong Kong businessman and leader (graduated 1881)
- George M. Church, professor of genetics, Harvard Medical School; pioneer of human genetics (graduated 1972)[7]
- Sloane Citron, magazine publisher (graduated 1974)
- Stephen Carlton Clark, art collector and philanthropist; founder of the Baseball Hall of Fame (graduated 1899?)
- Christian Clemenson, Emmy Award-winning film and television actor (graduated 1976)[8]
- Harlan Cleveland, U.S. Ambassador to NATO under President Lyndon B. Johnson (graduated 1934)
- Raymond C. Clevenger, judge for the U.S. Court of Appeals for the Federal Circuit (graduated 1955)
- Thomas Cochran, banker and philanthropist to Phillips Academy (graduated 1890)
- Edwin J. Cohn, protein scientist and blood fractionation expert (graduated 1911)
- Olivia Coffey, won the gold medal in the quad sculls at the 2015 World Rowing Championships as well as competed in 2016 Summer Olympics & The Boat Race 2018 (graduated 2007)
- William Sloane Coffin, reverend and peace activist (graduated 1942)
- Donald B. Cole, instructor in history and dean of Phillips Exeter Academy (graduated 1940)
- Frank Converse, actor (graduated 1956)
- Michael Copley, musician
- Joseph Cornell, sculptor (graduated 1921)
- Justin Cronin, author (graduated 1980)
- Sumner McKnight Crosby, art historian (graduated 1928)
- Bill Cunliffe, Grammy Award-winning composer, arranger, and jazz pianist (graduated 1974)[9]
- Peter Currie, Netscape executive, investor, and charter trustee of Phillips Academy (graduated 1974)[10][11]