| Saadi (5) | Safire, William (8) |
| Sagan, Carl (30) | Saint Ambrose (1) |
| Saint Augustine (9) | Saint Francis of Assisi (3) |
| Saint Jerome (6) | Saint Teresa of Avila (6) |
| Saint Theresa of Jesus (1) | Saint Thomas Aquinas (5) |
| Saint-Exupery, Antoine de (11) | Salinger, J. D. (5) |
| Salisbury, Lord (1) | Sallust (12) |
| Salzberg, Sharon (7) | Sandburg, Carl (9) |
| Santayana, George (12) | Saporta, Alan (1) |
| Sargent, Claire (1) | Sargent, John Singer (1) |
| Sartre, Jean-Paul (11) | Schiller, Friedrich von (3) |
| Scholtes, Peter (5) | Schopenhauer, Arthur (1) |
| Schrempp, Jurgen (1) | Schultz, Howard (1) |
| Schulz, Charles M. (10) | Schumacher, E. F. (3) |
| Schwab, Charles M. (2) | Schweitzer, Albert (7) |
| Scott, Sir Walter (5) | Scott-Maxwell, Florida (2) |
| Seeger, Pete (7) | Segal, Erich (4) |
| Seinfeld, Jerry (4) | Selden, John (7) |
| Seligman, Dan (1) | Sellers, Peter (1) |
| Sendak, Maurice (3) | Senge, Peter (1) |
| Serling, Rod (8) | Service, Robert (9) |
| Seuss, Dr. (10) | Shakespeare, William (28) |
| Shantideva (1) | Shaw, George Bernard (32) |
| Shayne, Gloria (1) | Shea, Michele (1) |
| Shedd, John A. (1) | Sheehan, George (2) |
| Sheffield, John (1) | Sheridan, Richard Brinsley (4) |
| Shiller, Robert J. (1) | Shingo, Shigeo (2) |
| Shneiderman, Ben (2) | Shook, John (2) |
| Sibelius, Jean (1) | Sidney, Sir Philip (3) |
| Sierra, Kathy (2) | Sigars, Chuck (4) |
| Simmons, Charles (1) | Simpson, Jessica (0) |
| Sinatra, Frank (2) | Sinclair, Upton (2) |
| Sinegal, James (1) | Singer, Isaac Bashevis (27) |
| Skinner, B. F. (2) | Sloan, John (1) |
| Sloane, Eric (1) | Smith, Adam (3) |
| Smith, Alexander (1) | Smith, Hannah Whitall (3) |
| Smith, Patti (1) | Smith, Ralph J. (1) |
| Smith, William A. (1) | Smothers, Tommy (1) |
| Snow, C. P. (2) | Sobran, Joseph (2) |
| Sockman, Ralph W. (3) | Socrates (23) |
| Solon (4) | Solzhenitsyn, Alexander (4) |
| Sophocles (14) | Sorensen, Jim (1) |
| Soros, George (1) | Sowell, Thomas (4) |
| Spalding, John Lancaster (3) | Spander, Art (1) |
| Spence, Gerry (2) | Spencer, Diana (1) |
| Spengler, Oswald (2) | Spinoza, Baruch (3) |
| Spock, Benjamin (2) | Spolsky, Joel (3) |
| Spurgeon, Charles Haddon (4) | Stafford, Jamison (1) |
| Stalin, Joseph (3) | Stallman, Richard (4) |
| Stanhope, Phillip Earl (2) | Stanislavsky, Konstantin (1) |
| Stanley, Bessie A. (1) | Stanton, Elizabeth Cady (5) |
| Stark, Freya Madeline (1) | Stark, General John (1) |
| Statius, Caecilius (4) | Stead, Christina (1) |
| Steele, Sir Richard (2) | Stefansson, Vilhjalmur (1) |
| Stein, Gertrude (6) | Stein, Leopold (1) |
| Steinbeck, John (6) | Stengel, Casey (2) |
| Stern, Gladys Bronwyn (1) | Sternberg, Robert (1) |
| Stevenson, Robert Louis (4) | Stewart, Martha (2) |
| Stewart, Mary (6) | Stickle, Sean (1) |
| Stimson, Henry (1) | Stimson, Henry L. (1) |
| Stinnett, Caskie (5) | Stolberg, Benjamin (1) |
| Stoll, Clifford (13) | Stone, Elizabeth (1) |
| Stone, Peter (1) | Stott, Henry G. (1) |
| Stout, Rex (1) | Stout, Ruth (1) |
| Strachey, Lytton (2) | Stravinsky, Igor (4) |
| Streisand, Barbra (2) | Stringer, Arthur (1) |
| Strunsky, Simeon (2) | Studdard, Ruben (4) |
| Sturgeon, Theodore (1) | Sumner, William Graham (1) |
| Sun-tzu (8) | Sutton, Kathleen A. (1) |
| Suyin, Han (4) | Suzuki, Shunryu (1) |
| Swanson, Claude (1) | Swetchine, Anne-Sophie (3) |
| Swift, Jonathan (8) | Switzer, Barry (1) |
| Swope, Herbert Bayard (1) | Szasz, Thomas (7) |