- Jurgensen, Iva, 1897-197554
- Jurgensen, Royal, 1894-197154
- Kahn, Ely Jacques, 1884-19721
- Kaufmann, Edgar J., 1885-1955244
- Kaufmann, Liliane244
- Kellogg, J. W., active 191323
- L'Enfant, Pierre-Charles 1754-18252
- Lamb, Thos. W. (Thomas White), 1871-19421
- Lamp, Robert, 1866-191624
- Lampué, Jean Pierre Philippe2
- Larkin Co.7
- Larwill, Mary, 1844-19286
- Leonard Schultz and Associates1
- Lewis, Kathryn, 1901-198452
- Lewis, Lloyd, 1891-194952
- Little, Francis, 1859-1923118
- Little, Mary, 1863-1941118
- Lloyd-Jones, Eleanor, 1845-19193
- Lloyd-Jones, Jane, 1848-19173
- Loewenstein, Gordon, 1894-198914
- Loewenstein, Lillian, 1903-198714
- Lowes, Charles, 1891-19637
- Lowes, Christina7
- Ludington, Florence, 1875-19512
- Ludington, Roland, 1869-19272
- Lusk, Jeanette, 1905-199314
- Lusk, Robert, 1902-196214
- MacMonnies, Frederick William, 1863-19375
- Mallery, Otto Tod, 1881-195656
- Manson, Charles, 1899-196871
- Manson, Dorothy, 1896-196371
- Marcel, Alexandre Auguste Louis2
- Marcus, Herbert3
- Marcus, Mary, 1909-197861
- Marcus, Stanley, 1905-200261
- Martin, D. D. (Darwin D.), 1865-1935183
- Martin, Emma L., active 19072
- Martin, Frank (Louis Franklin), 1852-19271
- Martin, Isabelle R. (Isabelle Reidpath)183
- Martin, William, 1862-193824
- Martin, Winifred, 1865-193824
- Mathews, Arthur, approximately 1923-15
- Mathews, Judith, 1925-200315
- Mauer, Allison, 1911-19959
- Mauer, Edgar F. (Edgar Frank), 1908-9
- May, Meyer11
- May, Sophia, 1879-191711
- McAfee, A. C., active 18942
- McArthur, Minnie, 1859-29
- McArthur, Warren, 1856-192432
- McCallum, George, 1875-194234
- McCormick, Edith Rockefeller, 1872-19325
- McCormick, Harold F. (Harold Fowler), 1872-19415
- McEvoy, J. P. (Joseph Patrick), 1895-19581
- McKim, Charles Follen, 1847-19093
- McKim, Mead & White556
- McLaughlin, James W., 1834-19231
- Melson, Joshua, 1865-194527
- Melson, Minnie, 1861-191527
- Mendelsohn, Jerome, active 191218