- S. Buck, Pearl (3)
- Sábato, Ernesto (1)
- Sagan, Françoise (3)
- Sainte-Beuve, Charles Augustin (1)
- Salinas, Pedro (1)
- Salk, Jonas (1)
- Salomón (5)
- Sampedro, Jose Luis (2)
- San Agustín (20)
- San Marcos (1)
- San Jerónimo (1)
- San Martín, José de (1)
- San Pablo (4)
- Sand, George (5)
- Sandburg, Carl (1)
- Santos, Manuel (1)
- Sanz, Alejandro (1)
- Saramago, José (1)
- Saroyan, William (1)
- Sartre, Jean Paul (6)
- Satrapi, Marjane (1)
- Savage, Robert (1)
- Savater, Fernando (3)
- Scheler, Max (1)
- Schiller, Friedrich Von (6)
- Schnitzler, Arthur (2)
- Schopenhauer, Arthur (3)
- Schrödinger, Erwin (1)
- Schulman, Tom (1)
- Schultz, Howard (1)
- Schulz, Charles M (2)
- Schweitzer, Albert (7)
- Scott, Walter (1)
- Sedd, John (1)
- Segal, Erich (1)
- Segovia, Andrés (1)
- Senders, Ramón J (1)
- Séneca (35)
- Senge, Peter (1)
- Sequeiros, Pablo (1)
- Serrano, Marcela (1)
- Serrat, Joan Manuel (2)
- Sevareid, Arnol Eric (1)
- Shakespeare, William (22)
- Shankar, Ravi (1)
- Sharma, Robin S. (5)
- Shaw, George Bernard (12)
- Shyer, Charles (1)
- Simoncelli, Paolo (1)
- Sinatra, Frank (1)
- Siro, Publio (7)
- Sivananda, Swami (8)
- Smiles, Samuel (5)
- Smith, Adam (1)
- Sócrates (7)
- Sófocles (3)
- Spencer, Herbert (1)
- Spinoza, Baruch Benedit (1)
- Spurgeon, Charles H (2)
- Stark, Freya (1)
- Stasiulis, Nerijus (1)
- Stein, Ben (1)
- Stein, William H (1)
- Steinbeck, John Ernst (1)
- Stendhal (2)
- Sterne, Laurence (2)
- Stevens, Earl Gray (1)
- Stevenson, Robert Louis (6)
- Stowe, Harriet Beecher (3)
- Suarez, Adolfo (1)
- Suzuki, D.T. (1)
- Swift, Jonathan (4)
- Swindoll, Charles (1)