- Canada. Privy Council Office1
- Canada. Railway Lands Branch1
- Canada. Surveyor General's Office1
- Canadian Bank of Commerce1
- Canadian Pacific Railway Company1
- Cannon, William F.1
- Canoe Country Outfitters1
- Cantelli, Giacomo, 1643-16951
- Carey & Hart1
- Carlson, D. R. (David Roy)1
- Carrigain, Philip, 1772-18421
- Carrington, F. A. (Frederic Alonzo), 1808?-19011
- Carver, Jonathan, 1710-17801
- Casseday, D. W1
- Century Company1
- Ceylon Observer Office1
- Chamouin, Jean Baptiste Marie, 1768-1
- Chapman and Hall1
- Chase, Ray P. (Ray Park), 1880-19481
- Chatelain, Henri Abraham1