Cailletet,
Louis Paul Callendar,
Hugh Longbourne Carlson,
Chester Cartwright,
Edmund Cassegrain Cayley,
George Chrysler,
Walter Percy Cierva,
Juan de la Claude,
Georges Cockerell,
Christopher (Sydney) Colles,
Abraham Colombo,
Matteo Realdo Corliss,
George Henry Cray,
Seymour Roger Creed,
Frederick George Crompton,
Rookes Evelyn Bell Cugnot,
Nicolas-Joseph Culshaw,
John Curtiss,
Glenn Hammond