- Jelliffe, Smith Ely, 1866-1945, author1
- Johnston, William W. (William Waring), 1843-1902, author1
- Jones, C. P., author1
- Jones, Samuel Arthur, 1834-19121
- Jordan, David Starr, 1851-1931, author1
- Keen, William W. (William Williams), 1837-19323
- Keen, William W. (William Williams), 1837-1932, author1
- Kelley, Samuel Walter, 1855-19291
- Kelly, Howard A. (Howard Atwood), 1858-19433
- Kelsey, Charles B. (Charles Boyd), 1850-1
- Kendrick, George W., Jr., author1
- Kent, J. T. (James Tyler), 1849-1916, author1
- Kibbe, A. B. (Alfred Beers), 1858-1904, author1
- Kickapoo Indian Medicine Co.1
- Kilbourne, Henry S., author1
- Kilmer, Fred B. (Fred Barnett), 1851-1934, author1
- Kings County Hospital (Kings County, N.Y.). School of Nursing, author.1
- Knerr, Calvin B. (Calvin Brobst), 1847-19401
- Kober, George M. (George Martin), 1850-1931 author1
- Kober, George M. (George Martin), 1850-1931, author3