- Saadi (1)
- S. Buck, Pearl (3)
- Sabah, Joe (1)
- Sábato, Ernesto (2)
- Sabina, Joaquín (1)
- Sacks, Oliver (1)
- Safier, David (1)
- Sagan, Françoise (4)
- Sainte-Beuve, Charles Augustin (1)
- Salinas, Pedro (1)
- Salk, Jonas (2)
- Salomón (9)
- Sampedro, Jose Luis (3)
- San Agustín (23)
- San Marcos (1)
- San Jerónimo (1)
- San Martín, José de (1)
- San Pablo (5)
- Sand, George (10)
- Sandberg, Sheryl (1)
- Sandburg, Carl (1)
- Santiago Apóstol (1)
- Santos, Manuel (1)
- Sanz, Alejandro (2)
- Saramago, José (2)
- Saroyan, William (1)
- Sarton, May (1)
- Sartre, Jean Paul (10)
- Satrapi, Marjane (1)
- Savage, Robert (1)
- Savater, Fernando (3)
- Savile, George (1)
- Scheler, Max (1)
- Scher, Estelle (1)
- Schiller, Friedrich Von (8)
- Schnitzler, Arthur (3)
- Schuller, Robert H (5)
- Schopenhauer, Arthur (6)
- Schrödinger, Erwin (1)
- Schulman, Tom (1)
- Schultz, Howard (1)
- Schulz, Charles M (2)
- Schweitzer, Albert (8)
- Scott, Walter (2)
- Sedd, William GT (1)
- Segal, Erich (1)
- Segovia, Andrés (1)
- Senders, Ramón J (1)
- Séneca (47)
- Senge, Peter (1)
- Sequeiros, Pablo (1)
- Serrano, Marcela (1)
- Serrat, Joan Manuel (5)
- Sevareid, Arnol Eric (1)
- Shakespeare, William (29)
- Shankar, Ravi (1)
- Sharma, Robin S. (10)
- Shaw, George Bernard (18)
- Shyer, Charles (1)
- Simoncelli, Paolo (1)
- Sinatra, Frank (1)
- Siro, Publio (9)
- Sivananda, Swami (8)
- Smiles, Samuel (6)
- Smith, Adam (1)
- Smith, John Alexander (1)
- Sócrates (8)
- Sófocles (3)
- Sparks, Nicholas (1)
- Spencer, Herbert (1)
- Spinoza, Baruch Benedit (1)
- Springsteen, Bruce (1)
- Spurgeon, Charles H (5)
- Stark, Freya (1)
- Stasiulis, Nerijus (1)
- Stein, Ben (1)
- Stein, William H (1)
- Steinbeck, John Ernst (2)
- Steindl-Rast, Daniel (1)
- Steinem, Gloria (1)
- Stendhal (2)
- Sterne, Laurence (3)
- Stevens, Earl Gray (1)
- Stevenson, Robert Louis (7)
- Stone, William Clement (2)
- Stowe, Harriet Beecher (3)
- Strauss, Neil (1)
- Suarez, Adolfo (1)
- Suzuki, D.T. (1)
- Suzuky, Shunryu (1)
- Suzuma, Tabitha (1)
- Swift, Jonathan (6)
- Swindoll, Charles (1)
