- KUHT-TV (Television station : Houston, Tex.)1
- Kandel, Alan D.1
- Kaplan, Helene L., 1933-1
- Kaplan, Helene, 1933-1
- Kassof, Allen1
- Katz, Daniel, 1903-19983
- Kay, Kira2
- Kean, Thomas H1
- Kean, Thomas H.5
- Kear, Paul Winfred 1887-2
- Keller, Beatrice Dunderdale Stokes 1900-19811
- Kelley, Nicholas, 1885-19651
- Kelly, James A1
- Kelsey, Clarence H.1
- Keniston, Kenneth1
- Kennan Institute for Advanced Russian Studies7
- Kennedy, Donald, 1931-1
- Keppel, Francis, 1916-19901
- Keppel, Frederick P. (Frederick Paul), 1875-1943307
- Kerr, Clark, 1911-20031
- Kerwin, Donald M., 1962-1
- King, Susan2
- Kinnear, Harold L.1
- Kirk, Dudley7
- Kirk, Grayson L. (Grayson Louis), 1903-19971
- Klein, Joel I., 1946-1
- Kline, Mary-Jo1
- Klineberg, Otto, 1899-19928
- Knapp, Dorothy W1
- Koch, T. W.1
- Kolesnikov, Andre? (Andre? Ivanovich)1
- Kosvitz, Milton R.1
- Krogman, Wilton Marion, 1903-19871
- Kunhardt Productions2
- LIASA (Association)1
- Lagemann, Ellen Condliffe, 1945-1
- Landes, Ruth, 1908-19913
- Lange, Gunnar, 1909-19767
- Larrabee, Eric1
- Lazansky, Edward, 1872-19551
- Lazarsfeld, Paul F., 1901-19761
- Le Sueur, Meridel1
- Leach, Penelope1
- League of Nations Non-Partisan Association (U.S.)1
- Learned, William S. (William Setchel), 1876-19502
- Learning Matters, Inc.3
- Lederberg, Joshua1
- Ledger-Dispatch Corp. (Norfolk, Va.)1
- Lee, C. Herbert1
- Lee, Pat Tourk1
- Legvold, Robert2
- Lehrer, James8
- Lemann, Nicholas1
- Lerman, Eleanor, 1952-1
- Lesser, Alexander, 1902-19824
- Lester, Robert M. (Robert MacDonald), 1889-196972
- Levey, Lisbeth A.1
- Levine, Arthur1
- Levine, Michael H1
- Lewinson, Paul, 1900-4