| Schisandra glabra | Schisandra glaucescens | Schisandra grandiflora |
| Schisandra henryi | Schisandra incarnata | Schisandra lancifolia |
| Schisandra longipes | Schisandra macrocarpa | Schisandra micrantha |
| Schisandra neglecta | Schisandra parapropinqua | Schisandra perulata |
| Schisandra plena | Schisandra propinqua | Schisandra pubescens |
| Schisandra pubinervis | Schisandra pyrifolium | Schisandra repanda |
| Schisandra rubriflora | Schisandra rubrifolia | Schisandra sphaerandra |
| Schisandra sphenanthera | Schisandra tomentella | Schisandraceae |
| Schism | Schistocyte | Schistosoma |
| Schistosoma haematobium | Schistosoma japonicum | Schistosoma mansoni |
| Schistosoma mekongi | Schistosomiasis | Schizoaffective disorder |
| Schizont | Schizophora | Schizophrenia |
| Schizophrenia and smoking | Schizopyrenida | Schizosaccharomyces |
| Schizosaccharomyces hominis | Schizosaccharomyces pombe | Schizosaccharomycetaceae |
| Schizosaccharomycetales | Schizosaccharomycetes | Schlater, Mississippi |
| Schläfli symbol | Schleicher ASG 29 | Schleicher ASH 25 |
| Schleicher ASH 26 | Schleicher ASK 21 | Schleicher ASK 23 |
| Schleicher ASW 22 | Schleicher ASW 24 | Schleicher ASW 27 |
| Schleicher ASW 28 | Schleithal | Schlenk flask |
| Schleswig, Iowa | Schleswig, Wisconsin | Schleswig-Holstein |
| Schley, Wisconsin | Schlieffen Plan | Schltdl. |
| Schltr. | Schlumberger brothers | Schlumberger SEED |
| Schmidt camera | Schmidt hammer | Schmidt number |
| Schmidt–Cassegrain telescope | Schneider CA1 | Schneiderian membrane |
| Schnersheim | Schnitzler syndrome | Schoenchen, Kansas |
| Schoenoplectus | Schoenoplectus lacustris | Schoenoplectus litoralis |
| Schoenoplectus mucronatus | Schoenoplectus triqueter | Schoepke, Wisconsin |
| Schofield, Wisconsin | Schoharie (village), New York | Schola Medica Salernitana |
| Scholarship | Scholasticism | Schomburgk |
| School | School health and nutrition services | School of Computer Science, University of Manchester |
| School of Edessa | School of Letters | School of Nisibis |
| School of Rock (فيلم) | School supplies | School uniform |
| School violence | Schoolcraft Township, Houghton County, Michigan | Schoolcraft Township, Kalamazoo County, Michigan |
| Schoolcraft, Michigan | Schools of history | Schopperten |
| Schortens | Schott | Schottky diode |
| Schrad. | Schram City, Illinois | Schrödinger equation |
| Schrödinger picture | Schrödinger's cat | Schrödinger–Newton equation |
| Schreb. | Schreckhorn | Schrenk |
| Schulenburg, Texas | Schult.f. | Schultens |
| Schulze method | Schum. | Schumacher criteria |
| Schuyler County, Missouri | Schuylerville, New York | Schuylkill County, Pennsylvania |
| Schwaben | Schwaben (region) | Schwacke |
| Schwandorf | Schwann cell | Schwannau |
| Schwartz–Zippel lemma | Schwarzschild metric | Schwarzschild radius |
| Schwäbisch Hall | Schweighouse-sur-Moder | Schweizer Aircraft |
| Schwenheim | Schwerer Gustav | Schwindratzheim |
| Schwobsheim | Schwyz frank | Schwyz gulden |
| Sci-Hub | Sciatica | Science |
| Science (journal) | Science and inventions of Leonardo da Vinci | Science and technology in Algeria |
| Science and technology in Europe | Science and technology in Iran | Science and technology in Italy |
| Science and technology in Russia | Science and technology in the United Kingdom | Science education |
| Science fiction | Science Hill, Kentucky | Science, technology and society |
| Sciencemed | ScienceWorld | Scientific |
| Scientific American | Scientific calculator | Scientific classification |
| Scientific communism | Scientific community | Scientific consensus |
| Scientific diving | Scientific evidence | Scientific foreknowledge in sacred texts |
| Scientific law | Scientific Linux | Scientific literacy |
| Scientific medicine | Scientific method | Scientific modelling |
| Scientific notation | Scientific racism | Scientific revolution |
| Scientific skepticism | Scientific socialism | Scientific theory |
| Scientific visualization | Scientism | Scientist |
| Scientology | Scientometrics | Scilab |
| Scilla | Scilla albanica | Scilla bifolia |
| Scilla bulbosa | Scilla bulgarica | Scilla libanotica |
| Scilla minima | Scilla siberica | Scilla villosa |
| Scilla viridis | Scilloideae | Scincidae |
| Scincinae | Scincomorpha | Scincus |
| Scincus albifasciatus | Scincus hemprichii | Scincus mitranus |
| Scincus scincus | Scintigraphy | Scintilla (software) |
| Scintillating scotoma | Scintillation (physics) | Scintillation counter |
| Scio Township, Michigan | Scio, Ohio | Scio, Oregon |
| Scion (automobile) | Scion tC | Sciota Township, Michigan |
| Sciota, Illinois | Scipio Township, Michigan | Scipio, Utah |
| Scipione Riva Rocci | Scipione Riva-Rocci | Scirii |
| Scirpoides holoschoenus | Scirpus | Scirpus radicans |
| Scirpus sylvaticus | Scirpus umbellatus | Scissors |
| SciTE | Scituate, Rhode Island | Sciuravida |
| Sciuridae | Sciurinae | Sciuromorpha |
| Sciurotamias | Sciurotamias davidianus | Sciurotamias forresti |
| Sciurus | Sciurus aberti | Sciurus anomalus |
| Sciurus lis | Sciurus nayaritensis | Sciurus vulgaris |
| Sciurus yucatanensis | Sclera | Scleritis |
| Scleroderma | Sclerometer | Scleromyositis |
| Scleronomous | Sclerophrys dodsoni | Sclerosing rhabdomyosarcoma |
| Sclerosis (medicine) | Sclerotome | SCO |
| SCO Group | Scobey, Montana | Scofield, Utah |
| Scoliosis | Scolopacidae | Scolopax rusticola |
| Scolopendra gigantea | Scolymus | Scolymus grandiflorus |
| Scolymus hispanicus | Scolymus maculatus | Scolytina |
| Scolytinae | Scolytini | Scolytus |
| Scolytus fagi | Scolytus laricis | Scolytus mali |
| Scolytus multistriatus | Scolytus praeceps | Scolytus quadrispinosus |
| Scolytus rugulosus | Scolytus scolytus | Scolytus unispinosus |
| Scomber scombrus | Scomberomorus commerson | Scombridae |
| Scooba, Mississippi | Scoopula | Scoot McNairy |
| Scooter Libby | Scop. | Scope (computer science) |
| Scope statement | Scope TV | Scopes Trial |
| Scopeumatinae | Scophthalmus maximus | Scopitone |
| Scopolamine | Scopoli | Scopophilia |
| Scops owl | Scopus umbretta | SCORAD |
