- McClelland, M. A., author1
- McCowen, Jennie.1
- McFarland, Andrew, 1817-18911
- McGary, William L., author1
- McGee, Anita Newcomb, 1864-1940, author1
- McGowan, Jonas Hartzell, 1837-19091
- McGowan, Jonas Hartzell, 1837-1909, author1
- McIlvaine, R. R. (Robert R.), author1
- McLaren, J. L., author1
- McMaster, William E.1
- McQuillen, J. H. (John Hugh), 1826-18791
- McQuillen, J. H. (John Hugh), 1826-1879 author1
- Medical Society of the State of California.1
- Meredith, William M. (William Morris), 1799-18731
- Merriam, C. Hart (Clinton Hart), 1855-1942, author1
- Metcalfe, John T. (John Thomas), -19021
- Metropolitan Life Insurance Company. Industrial Department1
- Military Order of the Loyal Legion of the United States.1
- Miller, Henry W. (Henry Watkins), 1813-18621
- Mills, Charles K. (Charles Karsner), 1845-19311