- s ... SA-8 Gecko
- SA-9 Gaskin ... Sabaoth
- sabar ... sabot
- sabot ... sacerdotalism
- sacerdotium ... sacred artifact
- sacred baboon ... sadaebu
- Sadahito ... sadomasochism
- Sadoveanu, Mihail ... Safety of Objects, The
- safety pin ... Sager, Ruth
- Sagesse ... Sahidic
- Ṣaḥīḥ ... Sailor and Fiddler: Reflections of a 100-Year-old Author
- Sailor Moon ... Saint Cyriacus, Church of
- Saint David’s ... Saint Josaphat, Basilian Order of
- Saint Joseph ... Saint Moritz
- Saint Nicholas Cathedral ... Saint-Apollinaire, Cathedral of
- Saint-Arnaud, Armand-Jacques Leroy de ... Saint-Marien, Mount
- Saint-Martin ... sainthood
- Saintonge ... Sakdal Uprising
- sakdi na ... śalākāpuruṣa
- salal ... Salek, Mustafa Ould
- Salekhard ... Salina Island
- Salinari, Carlo ... Salminus maxillosus
- Salmo ... salsa
- salsa cruda ... saltlike compound
- salto ... Salween River
- Salyut ... Samaritan Pentateuch
- samarium ... Samkashya
- Samkhya ... Samson
- Samson Agonistes ... San Antonio, Cathedral of
- San Antonio, Church of ... San Francisco ballrooms
- San Francisco Bay ... San Juan de Ulúa, Battle of
- San Juan del Monte ... san no tsuzumi
- San Pa-lo ... Sanches, Francisco
- Sánchez Cerén, Salvador ... sand boil
- sand bug ... Sandeau, Jules
- Sandeau, Léonard-Sylvain-Julien ... sandtiger
- Sandú, Policarpo ... Sangha River
- Saṅghamitthā ... Sankt Maria im Kapitol
- Sankt Michael ... Sant’Anna dei Palafrenieri
- Sant’Anna, Sérgio ... Santa Fe Independent School District v. Doe
- Santa Fe Institute ... Santa Ursula y las Once Mil Virgenes
- Santa, Mount ... Santo Antão Island
- Santo Antônio de Piracicaba ... São Filipe de Benguela
- São Francisco craton ... Sapium sebiferum
- Sāpmi ... Sāradā script
- Saradamani Mukhopadhyaya ... Sarcee
- sarcina ... Sargent, Sir Harold Malcolm Watts
- Sargent, Sir John Philip ... Sarraut, Albert-Pierre
- Sarraute, Nathalie ... Saskatchewan River
- Saskatchewan Roughriders ... Sathalanalat Paxathipatai Paxaxôn Lao
- Sati ... Saturday
- Saturday Big Tent Wedding Party, The ... Saudi gazelle
- Saudi Peace Initiative ... Sauternes
- Sautrāntika ... Savile, Sir Henry
- Savile, Sir James Wilson Vincent ... Sawdāʾ, Qurnat as-
- sawdust ... Sayat-Nova
- Sayce, Archibald H. ... SBF
- SBI ... Scalise, Steve
- scallion ... scarabaeiform larva
- Scarabaeinae ... SCAT
- scat singing ... Schachter-Singer model
- Schack Gallery ... Scheemakers, Peter
- Scheer, Andrew ... Schick, Jacob
- Schickard, Wilhelm ... schizoid personality disorder
- schizomid ... Schmalkaldischer Bund
- Schmallenberg virus ... Schnitter, Johann
- Schnittke, Alfred ... school figure
- School for Dictators, The ... Schrieck, Sister Louise Van der
- Schrieffer, John Robert ... Schumannianthus dichotomus
- Schumer, Amy ... Schwarzschild singularity
- Schwarzschild, Karl ... Science of Logic
- Science of Mind ... scission
- scission point ... Scomberesox saurus
- Scomberomorus ... Scorpius X-1
- Scorsese, Martin ... Scott, Joan Wallach
- Scott, John ... Scrabble
- scramble competition polygyny ... Scribes and Illuminators, Society of
- scribing ... scuffing the ball
- scull ... SDS
- SDS ... sea moss drink
- sea moth ... seafloor spreading
- seafloor spreading centre ... seascape
- Seascape ... Sebastea
- Sebasteia ... Second Barbra Streisand Album, The
- Second Barrier Treaty ... Second Republic
- Second Republic ... secondary intention
- secondary interjection ... secret speech
- Secret to Superhuman Strength, The ... SED
- Sed Festival ... See Me
- See My Friends ... Sefer ha-gevulim
- Sefer ha-Halakhot ... segregation
- segregation ... seisin
- seismic array ... Selaginella uncinata
- Selaginellaceae ... selenium compound
- selenium dioxide ... self-propriety
- self-realization ... Selma March
- Selma March Timeline ... semiautomatic rifle
- semiautomatic shotgun ... Semnai Theai
- Semnān ... Send Me No Flowers
- Sendai ... Sennabris
- Sennacherib ... sentence
- sentence ... separation, isotope
- separatism ... sequencing
- sequent occupance ... Serenade
- serenade ... series limit
- series magnetic circuit ... Serpentine, the
- Serpico ... service dog
- Service Employees International Union ... SET
- set ... Settlements, Book of
- Settlers and Convicts; or, Recollections of Sixteen Years’ Labour in the Australian Backwoods ... Seven Sleepers of Ephesus
- Seven Slips from the Bookbag of the Clouds ... Severnaia Zemlia
- Severnaja Zeml’a ... sex cell
- sex chromatin ... Sexualwissenschaft, Institut für
- Sexy Back ... SGI–USA
- SGML ... shadow clock
- Shadow Country ... Shah Jahān
- Shāh Jahān II ... Shakes the Clown
- Shakespeare ... Shallow Breath
- shallow earthquake ... Shanahan, Kyle Michael
- Shanahan, Mike ... Shannon, Claude Elwood
- Shannon, Del ... Shaq
- Shaqīq al-Balkhī ... sharo
- Sharon ... Shaughnessy of Montreal and Ashford, Thomas George Shaughnessy, 1st Baron
- Shaughnessy, Clark Daniel ... Shazar, Zalman
- Shāzilīyah ... Sheba Ridge
- Sheba, Baby ... sheetpiling
- sheetwash ... shell
- shell atomic model ... Shenandoah National Park
- Shenandoah Valley ... Shepparton
- Sheppey, Isle of ... Sheryl Crow
- Sheshonk I ... Shields, Julia Catherine
- Shields, Mark ... Shillong
- Shillong Peak ... shingle
- shingle ... Shipman, Harold Frederick
- Shippard, Sir Sidney Godolphin Alexander ... shitagasane
- Shitala ... shock cavalry
- Shock Corridor ... Shona literature
- Shonaprastha ... short takeoff and landing airplane
- short ton ... Shortughai
- shortwall method ... showbread
- Showdown ... Shriranga III
- Shrirangapatna ... Shujāʿ ibn Mana
- Shujāʿ Mirza ... shutter
- shutter ... Sianis, Billy
- Siassi Islands ... Sichel, Sebastián
- Sicherheitsdienst ... side-boom dredge
- side-chain theory ... Siebenbürger rug
- Siebengebirge ... Sierra Entertainment
- Sierra evergreen chinquapin ... Sigismund
- Sigismund ... Signs of Life
- Signs of the Times ... Silbury Hill
- Silchar ... silicon carbide
- silicon detector ... Silman, Idit
- Silmarillion, The ... silver hake
- silver halide ... Sima Qian
- Sima Tan ... Simmons, Jean Merilyn
- Simmons, Jonathan Kimble ... Simoun, Le
- Simović, Dušan ... Simpson, Wallis
- Simpson, Wallis Warfield ... Sinatra, Nancy Sandra
- Sinatruces ... Singelgracht
- Singer Building ... single standard
- single tax ... Sinjohn, John
- sink ... sinus venosus
- sinus, venous ... Sir Walter Scott on chivalry
- Sira puranam ... Sisaket
- sisal ... sit-in movement
- Sita ... Siverskodonetske
- Siverskyy Donets ... Sixtus V
- sixty-six ... Skaw, The
- skaz ... skin beetle
- skin cancer ... Skouphas, Nicholas
- Skowhegan School of Painting and Sculpture ... slab sea anchor
- slab track ... slaty-backed nightingale thrush
- slaty-capped shrike-vireo ... sleep
- Sleep and Poetry ... Slick, Grace
- Slick, Jonathan ... slipper shell
- slipperwort ... Slovene language
- Slovene literature ... SM fiber
- SMA ... Smart contracts vs. dApps—how are they different?
- smart drug ... SMiLE
- smile ... Smith, Elliott
- Smith, Emily James ... Smith, Norman Kemp
- Smith, O. P. ... smithsonite
- Smithton ... smothering
- Smothers Brothers Comedy Hour, The ... snap the whip
- Snap the Whip ... Snobs of England, by One of Themselves, The
- Snodgrass, W.D. ... snowbush
- Snowden ... So You Wannabe an Outlaw
- So you want to buy a car? What to know before visiting the dealer ... Social Cancer, The
- social capital ... Social Learning and Imitation
- social life ... Socialist Labour Party of Germany
- socialist law ... sociometry
- sociopathic personality disorder ... sodium inactivation
- sodium iodide ... soft real-time system
- soft rot ... soil centipede
- soil chemistry ... Solanaceae
- Solanales ... solarization
- Solaro della Margarita, Clemente, Count ... solicitor general
- solid ... Solly, Thomas
- solmization ... Solṭāniyyeh
- Solti, Georg ... somatotroph
- somatotroph adenoma ... Something of Value
- Something to Be Desired ... Son of the Morning Star: Custer and the Little Bighorn
- Son of the Pink Panther ... Song of Roland, The
- Song of Russia ... Songs to Krishna
- Songs Without Words ... Soong, James
- Soong, T.V. ... Sorbon, Robert de
- Sorbonne Université ... sorosilicate
- Soroush, Abdolkarim ... Sotomayor, Sonia
- Sotomayor, Sonia Maria ... sound design
- sound effect ... Sousa
- Sousa ... South Asia
- South Asian arts ... South Island
- South Island ... South West Africa
- South West Africa National Union ... Southern Aslian languages
- Southern Associated Press ... Southern Pacific Co. v. Arizona
- Southern Pacific Railroad ... Southwest National Park
- Southwest Texas State Normal School ... Soyedineniye i perevod chetyrokh yevangeliy
- Soyet ... space lattice
- Space Launch System ... Spalding, Albert
- Spalding, Albert Goodwill ... Spanish Socialist Workers’ Party
- Spanish Southern Morocco ... Spathiphyllum
- Spathodea campanulata ... special education
- special effects ... Speck, Frank Gouldsmith
- Speck, George ... speech synthesizer
- speech therapy ... Spencer, Christopher M.
- Spencer, Christopher Miner ... Speyer, Wendelin von
- Speyer, Wilhelm ... Sphinx of Giza
- sphota ... Spies Like Us
- Spies Like Us: 10 Famous Names in the Espionage Game ... Spindletop
- spine ... Spiral
- spiral ... spiritual marriage
- spiritual philosophy ... spline approximation
- splint coal ... spongy moth
- spongy parenchyma ... Sports Night
- sports psychology ... spray
- Spray ... Springbett, Berta Lynn
- springboard diving ... Sputnik Sweetheart
- sputter ion pump ... squash
- squash ... Sremska Mitrovica
- Sremski Karlovci ... SSEM
- Ssentamu, Robert Kyagulanyi ... St. Helena Island
- St. Helena, Chapel of ... St. Mary of Zion, Church of
- St. Mary Peak ... Staatsicherheit
- Staatskapelle Dresden ... staff-tree family
- Staffa ... Stainless Banner
- stainless steel ... Stamkos, Steven
- Stammbaumtheorie ... standard Poodle
- standard schnauzer ... Stanislav
- Stanislav of Znojmo ... Staphyleaceae
- Staphylinidae ... Star Wars
- Star Wars ... Starlight Express
- starlight scope ... State and Revolution, The
- State Animals of India ... State of Qatar
- State of Rhode Island and Providence Plantations, The ... static
- static compression test ... statute law
- Statutes Concerning Peasants Leaving Serf Dependence ... steam carriage
- steam coal ... Steenrod, Norman
- Steensen, Niels ... Stein, William Howard
- Stein-Leventhal syndrome ... Stellenbosch
- Stellenbosch tool complex ... step regulator
- step-by-step switch ... Stepnoy Korol Lir
- Steppe ... Sterling, Donald
- Sterlitamak ... Stevenage
- Stevens Point ... Stewart, Jimmy
- Stewart, John Innes Mackinstosh ... Stiernhielm, Georg
- Stiers, David Ogden ... Stillwater
- Stillwater Complex ... Stirling Range National Park
- Stirling the Venetian ... stockholder
- Stockholm ... Stokes-Adams syndrome
- Stokesay ... Stone Temple Pilots
- stone thrower ... Stony Tunguska River
- Stonyhurst College ... Storia della bambina perduta
- Storia della letteratura italiana ... Story of G.I. Joe, The
- Story of Louie, The ... Strachey, John
- Strachey, Lytton ... Strange Angels
- strange attractor ... Strasser, Joseph
- Strasser, Otto ... Strato of Lampsacus
- Strato Physicus ... Stray Cats
- Stray Thoughts on the Intended Primary Schools in Finland ... Streitberg, Wilhelm
- Streitschriften ... striae
- striate area ... Stringocephalus
- strings ... Strombacea
- Strombidae ... Strouma River
- Stroustrup, Bjarne ... Struve, Pyotr Berngardovich
- Struve, Vasily Yakovlevich ... Stuart, Maria Henriette
- Stuart, Maria Henriette ... Study Finds ADHD Content on TikTok Is Less Than 50 Percent Accurate
- Study for an End of the World ... Sturmer, Boris Vladimirovich
- Stürmer, Der ... Styx
- Styx ... subchondral bone
- subclavian artery ... sublitharenite
- sublittoral zone ... substantia gelatinosa
- substantia nigra ... Succineidae
- succinic acid ... Sudan, southern
- Sudanese ... Sufayd Khūn
- sufet ... Sugimoto Hiroshi
- Sugimoto, Hiroshi ... Sukhothai
- Sukhothai Historical Park ... Süleyman I
- Süleyman I the Magnificent, Mosque of ... Suliman Solong
- Sulina ... sulphur sesquioxide
- sulphur tetroxide ... Sumer is icumen in
- Sumeria ... summer sweet
- summer tanager ... Sun I-hsien
- Sun into Ourselves, The ... Sunday Express
- Sunday in New York ... Sunny Afternoon
- Sunny Side of the Street ... Super Bowl IV
- Super Bowl IX ... superb lyrebird
- superb warbler ... superlattice
- superlens ... Suppé, Franz von
- Supper at Emmaus, The ... Supreme Court
- Supreme Court ... surety
- surety bond ... Suricata suricatta
- suricate ... Surtur
- surubí ... Suspect
- suspect ... Sutherland, Edwin
- Sutherland, Efua ... Suzuki Bunji
- Suzuki Daisetsu Teitarō ... SVG
- Sviatopolk-Mirskii, Pyotr Danilovich ... swamp
- Swamp Angel ... Swarthmore College
- Swartkrans ... sweet acacia
- Sweet Adeline ... Sweetest Dream, The
- Sweetest Taboo, The ... Swindle, The
- Swindon ... switchgrass
- switching ... Sykaminos
- Sykes, Eric ... symbolism
- Symbolist Movement in Literature, The ... Symphony in E Minor, Op. 32
- Symphony in Three Movements ... Syn
- Syn-Ket ... syngenism
- Syngonanthus ... Synthetisches Cino der Malerei
- Synthetism ... System der Werttheorie
- System der Wissenschaften nach Gegenständen und Methoden, Das ... Szálasi, Ferenc
- Szamos River ... Sʿadad-Dīn
