- Poetry Society of America1
- Post War World Council1
- Rare Book and Manuscript Library1
- Ridge, Lola, 1873-19411
- Riesman, David, 1909-20021
- Rodman, Selden, 1909-20021
- Rosenberg, James N (James Naumburg), 1874-19701
- Rukeyser, Muriel, 1913-19801
- Ryskind, Morrie, 1895-19851
- Sarton, May, 1912-19951
- Scott, Evelyn, 1893-19631
- Seaver, Edwin, 1900-19871
- Shapley, Harlow, 1885-19721
- Spender, Stephen, 1909-19951
- Speyer, Leonora, 1872-19561
- Steegmuller, Francis, 1906-19941
- Stevenson, Adlai E (Adlai Ewing), 1900-19651
- Stolberg, Benjamin, 1891-19511
- Strong, William Lafayette, 1827-19001
- Tarbell, Ida M (Ida Minerva), 1857-19441