| Author (number of quotes) | Description |
| Sa |
| Sabin, Louis (1) | |
| Sacks, Oliver (1) | English neurologist |
| Sadat, Anwar (1) | |
| Sagan, Carl (46) | American astronomer, astrophysicist, cosmologist, author |
| Sagan, Francoise (1) | French author |
| Saint-Exupéry, Antoine de (11) | French author and pilot |
| Saint-Laurent, Yves (1) | French fashion designer |
| Salecl, Renata (1) | Slovene sociologist and philosopher |
| Salinger, Jerome David (1) | American author |
| Salk, Jonas (1) | American doctor |
| Samuelson, Paul (1) | American economist |
| Sand, George (1) | French author |
| Sandburg, Carl (6) | American author and poet |
| Sandler, Adam (1) | American actor and producer |
| Santayana, George (10) | American philosopher, author, poet |
| Sarandon, Susan (1) | American actress |
| Sarton, May (2) | pen name of Eleanore Marie Sarton, American poet |
| Sartre, Jean-Paul (5) | French philosopher |
| Satir, Virginia (1) | American author and therapist |
| Sayers, Dorothy L. (1) | English crime writer, poet |
| Sc |
| Scannell, Donal (1) | |
| Schattke, Jonathan (1) | American IT technician |
| Scheffer, Victor B. (1) | American biologist |
| Schlegel, Friedrich von (1) | German philosopher and author |
| Schmidt, Dan (2) | author |
| Schopenhauer, Arthur (11) | German philosopher |
| Schuller, Robert Harold (3) | American clergyman, author, and TV personality |
| Schulz, Charles Monroe (1) | American cartoonist |
| Schutz, Susan Polis (1) | |
| Schwartz, Morrie (1) | American sociology professor |
| Schwarzenegger, Arnold (6) | Austrian and American bodybuilder, actor, politician |
| Sculley, John (1) | American businessman |
| Se |
| Seaborg, Glenn T. (2) | American scientist |
| Seagal, Steven (1) | American actor, film producer, screenwriter, martial artist, and musician |
| Sebold, Alice (1) | American author |
| Sedaris, Amy (1) | American actress, author, and comedian |
| Seeger, Pete (1) | American folk singer |
| Segel, Jason (1) | American actor, screenwriter and musician |
| Seinfeld, Jerry (1) | American stand-up comedian |
| Service, Robert (1) | English-Canadian author and poet |
| Setterfield, Diane (1) | |
| Seuss, Dr. (1) | |
| Seuss Geisel, Theodor (1) | |
| Sexton, Anne (1) | American author and poet |
| Sextus (4) | Ancient Greek philosopher |
| Sh |
| Shaddix, Jacoby (1) | American musician, singer, songwriter, rapper and actor |
| Shaffer, Mary Ann (1) | |
| Shakespeare, William (13) | English playwright, poet, actor |
| Shakur, Afeni (1) | |
| Shakur, Tupac Amaru (5) | American musician |
| Shames, Laurence (1) | American author and journalist |
| Shamsie, Kamila (1) | |
| Shan, Darren (2) | Irish-born author |
| Shankly, Bill (1) | Scottish football player and manager |
| Shapiro, Harold S. (1) | Swedish-American mathematician |
| Shaw, George Bernard (19) | Irish-born playwright |
| Sheehan, George (1) | American author |
| Sheen, Fulton John (1) | American bishop |
| Sheeran, Ed (3) | English singer and songwriter |
| Sheffield, Rob (1) | American music journalist and author |
| Shelley, Mary (4) | English author |
| Shelley, Percy Bysshe (2) | English poet |
| Sheppard, Mark (1) | English actor, musician and producer |
| Sheridan, Nicollette (1) | English actress |
| Shermer, Michael (15) | American science writer |
| Shinn, Florence Scovel (1) | American illustrator and author |
| Shore, Dinah (1) | American singer and actress |
| Shriver, Lionel (1) | |
| Shusterman, Neal (1) | American author |
| Si |
| Silva-Cardillo, Delfina (1) | |
| Simic, Charles (1) | Serbian-American poet |
| Sinatra, Frank (2) | American musician and actor |
| Sinek, Simon (3) | English author, motivational speaker |
| Singer, Michael A. (1) | |
| Sitwell, Edith (1) | British poet and critic |
| Sk |
| Skinner, B. F. (1) | American psychologist and author |
| Sm |
| Smiles, Samuel (1) | Scottish author and reformer |
| Smiley, Jane (1) | Americal novelist |
| Smith, Adam (1) | Scottish economist and philosopher |
| Smith, Al (1) | American politician |
| Smith, Alexander (1) | |
| Smith, Kevin (1) | American screenwriter, director, and actor |
| Smith, Will (1) | stage name of Willard Christopher Smith, Jr., American actor, singer, and producer |
| Smolin, Lee (4) | American theoretical physicist |
| Sn |
| Snicket, Lemony (14) | pen name of Daniel Handler, American author |
| So |
| Socrates (1) | Greek Athenian philosopher |
| Sokal, Alan (1) | American mathematican |
| Sophocles (2) | |
| Southey, Robert (1) | English poet |
| Sp |
| Spacey, Kevin (1) | American actor, producer and singer |
| Spalding, John Lancaster (1) | |
| Sparks, Nicholas (29) | American author |
| Speedman, Scott (1) | English-born Canadian actor |
| Spence, Gerry (2) | American lawyer |
| Spencer, Herbert (1) | English philosopher, biologist |
| St |
| Staley, Layne (3) | American musician, singer and author |
| Stallone, Sylvester (1) | American actor, filmdirector, and screenwriter |
| Statham, Jason (1) | English actor, producer, and martial artist |
| Stein, Gertrude (2) | American author |
| Steinbeck, John (6) | American author |
| Steinem, Gloria (1) | American feminist and author |
| Stengel, Casey (1) | American baseball player and coach |
| Stevens, Dan (1) | English actor |
| Stevenson, Robert Louis (1) | Scottish writer and poet |
| Stewart, Ian (1) | |
| Stiefvater, Maggie (7) | American author |
| Stiles, Julia (2) | American actress |
| Stills, Stephen (1) | |
| Stoker, Bram (1) | Irish novelist |
| Stone, Elizabeth (1) | |
| Stone, Emma (1) | American actress |
| Stone, Sharon (3) | American actress and producer |
| Stoppard, Tom (1) | |
| Stowe, Harriet Beecher (1) | American author |
| Streep, Meryl (1) | American actress |
| Strom, Kevin Alfred (1) | American businessman |
| Styles, Harry (3) | English pop singer and actor |
| Su |
| Surowiecki, James (3) | American journalist |
| Suvari, Mena (1) | American actress, fashion designer and model |
| Suzuki, David (1) | Canadian academic |
| Suzuma, Tabitha (1) | English author |
| Sw |
| Swift, Jonathan (4) | Irish-born author |
| Swift, Taylor (3) | American country-pop singer, songwriter, and actress |
| Swindoll, Charles Rozell (2) | American clergyman and author |
| Sy |
| Sykes, Oliver (1) | English musician |
| Syrus, Publilius (4) | Latin writer |
| Sz |
| Szabó, Magda (4) | Hungarian author, translator |
| Szasz, Thomas Stephen (1) | Hungarian-born American psychiatrist |
| Szent-Györgyi, Albert (2) | Hungarian biochemist |
| Szilárd, Leó (1) | Hungarian physicist |