- Buckman, Geo. Rex (George Rex)1
- Calosci, Umberto1
- Calvesi, Maurizio1
- Cape Ann Historical Association1
- Carli, Mario, 1889-19351
- Carpenter Electric Heating Manufacturing Company1
- Chaleix, Pierre1
- Chekhonin, Sergei Vasil'evich, 1878-19361
- Chicago, Rock Island and Pacific Railway Company1
- Cobb, Charlie, 1943-1
- Cohn-Bendit, Daniel1
- Cole, Bob, 1868-1911. Queen of Shinbone Alley1
- Coleman Color Studio1
- Compagnie de l’art brut (Paris, France)1
- Constantin Film (Firm)1
- Corinne, Tee, 1943-20061
- Craig, Edward Gordon, 1872-19661
- Craven, Henry Hawes, 1837-19101
- Crawford, Nelson Antrim, 1888-1
- Creamer, Henry, 1879-19301
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