- Canada. Bureau of Agriculture.1
- Carleton, Mrs1
- Carroll, Thos. (Thomas), 1795-18711
- Cartwright, Samuel A. (Samuel Adolphus), 1793-18632
- Casanova, J. N. (Juan Norberto)1
- Central Provinces (India). Sanitary Commissioner.2
- Chabert, J. X. (Julien Xavier), 1792-18591
- Chapman, John, 1822-18944
- Chevalier, T. W.1
- Christie, Alexander Turnbull.2
- Clanny, William Reid, 1776-18501
- Clemow, Frank G. (Frank Gerard), 1863-19391
- College of Physicians of Philadelphia.1
- Collier, George Frederick, 1799-18771
- Collins, G. T. (George T.), M.D1
- Cooke, John Esten, 1783-18532
- Cooke, William, 1785-18731
- Copland, James, 1791-18701
- Corbyn, Frederick.1
- Coventry, C. B. (Charles Brodhead), 1801-18752