| Selim Matar | Selim Teber | Selima Sfar |
| Selimiye Camii | Selimiye Mosque | Selin Demiratar |
| SELinux | Selita Ebanks | Seljuq dynasty |
| Selkirk Rex | Sella turcica | Selles, Pas-de-Calais |
| Sello Muso | Selma (film) | Selma Blair |
| Selma Burke | Selma Lagerlöf | Selma Township, Michigan |
| Selma, Texas | Selman Waksman | Selmer, Tennessee |
| Selous' mongoose | Seltz | Selwa Al-Hazzaa |
| SEM | Semaine ? | Semantic compaction |
| Semantic desktop | Semantic loan | Semantic network |
| Semantic search | Semantic Web | Semantics |
| Semantics (computer science) | Semaphore (programming) | Semaphore line |
| Semecarpus anacardium | Semen | Semen analysis |
| Semen quality | Semey | Semi-active radar homing |
| Semi-arid climate | Semi-automatic pistol | Semi-automatic rifle |
| Semi-automatic transmission | Semi-empirical mass formula | Semi-major axis |
| Semi-presidential system | Semi-Pro | Semiana |
| Semicircular canal | Semiclassical physics | Semiconductor |
| Semiconductor carrier mobility | Semiconductor detector | Semiconductor device |
| Semiconductor device fabrication | Semicossyphus reticulatus | Semih Aydilek |
| Semih Şentürk | Semih Kaya | Semiha Yankı |
| Semiheavy water | Semilunar hiatus | Semimembranosus |
| Seminal colliculus | Seminal vesicle | Seminal vesicles |
| Seminar | Seminary, Mississippi | Seminole County, Florida |
| Seminole, Oklahoma | Semiosis | Semiotics |
| Semiotics of culture | Semipalatinsk Test Site | Semiperimeter |
| Semipermeable membrane | Semirom County | Semis |
| Semitendinosus | Semitic languages | Semitic people |
| Semitic root | Semitic studies | Semitic-speaking peoples |
| Semmelweis reflex | Semmes, Alabama | Semnones |
| Semnopithecus | Semovente 105/25 | Semovente 47/32 |
| Semovente 75/46 | Semovente 90/53 | Sempervivum tectorum |
| Sempy | Semyon Antonov | Semyon Dezhnev |
| Senad Kreso | Senad Lulić | Senad Tiganj |
| Senakhtenre Ahmose | Senan, Iran | Senate of Colombia |
| Senate of the Netherlands | Senatobia, Mississippi | Send-e Bala |
| Send-e Pain | Sendai Airport | Sendhil Ramamurthy |
| Seneca Gardens, Kentucky | Seneca the Younger | Seneca Township, Michigan |
| Seneca, Crawford County, Wisconsin | Seneca, Green Lake County, Wisconsin | Seneca, Illinois |
| Seneca, Kansas | Seneca, Oregon | Seneca, Shawano County, Wisconsin |
| Seneca, South Carolina | Seneca, South Dakota | Seneca, Wood County, Wisconsin |
| Senecaville, Ohio | Senecio | Senecio aegyptius |
| Senecio belbeysius | Senecio bertramii | Senecio blanchei |
| Senecio breviflorus | Senecio chalureaui | Senecio delbesianus |
| Senecio doriiformis | Senecio flavus | Senecio glaucus |
| Senecio leucanthemifolius | Senecio sempervivus | Senecio vulgaris |
| Senecioneae | Senecioninae | Senegal |
| Senegal Premier League | Senegalia catechu | Senegambia (Dutch West India Company) |
| Senegambia Confederation | Senenmut | Senetic |
| Seney Township, Michigan | Sengoku Basara | Sengoku Basara 2 |
| Sengoku Basara 4 | Sengoku Basara: End of Judgement | Sengoku Basara: Samurai Heroes |
| Sengoku Basara: Samurai Kings | Sengoku Basara: The Last Party | Senijad Ibričić |
| Senile Dementia | Seninghem | Senior house officer |
| Senior management | Senjūrō Hayashi | Senjed, Yazd |
| Senjedak, Fariman | Senjetak, Fariman | Senkaku Islands |
| Senlecques | Senlis, Pas-de-Calais | Senna |
| Senna (genus) | Senna alexandrina | Senna didymobotrya |
| Sennar (sultanate) | Senneferi | Senoia, Georgia |
| Sensation | Sense | Sense (molecular biology) |
| Sense and Sensibility | Sense and Sensibility (film) | Sense of agency |
| Sense of community | Sense-for-sense translation | Sense8 |
| Sensible heat | Sensitivity (human) | Sensitivity analysis |
| Sensitization | Sensor | SENSOR-Pesticides |
| Sensory design | Sensory garden | Sensory nerve |
| Sensory neuron | Sensory processing disorder | Sensory room |
| Sensory system | Sensory systems | Sentani Airport |
| Sentence (linguistics) | Sentence extraction | Sentence spacing |
| Sentience | Sentiment analysis | Sentinel Butte, North Dakota |
| Senzo Meyiwa | SEO | Seogwipo |
| Seol Ki-hyeon | Seoul | Seoul Broadcasting System |
| Seoul broadcasting system | Seoul Samsung Thunders | Sepahan Airlines Flight 5915 |
| Sepal | Separable verb | Separate Tables (film) |
| Separation anxiety disorder | Separation barrier | Separation of church and state |
| Separation of concerns | Separation of powers | Separation process |
| Separatism | Separator (oil production) | Separatory funnel |
| SEPECAT Jaguar | Sephia | Sepia |
| Sepidar Rural District | Sepideh, Iran | Sepiida |
| Sepiola atlantica | Sepp Blatter | Sepp Herberger |
| Sepp Maier | Sepp Piontek | Sepsis |
| September 1 | September 10 | September 11 |
| September 11 attacks | September 12 | September 13 |
| September 14 | September 15 | September 16 |
| September 17 | September 18 | September 19 |
| September 2 | September 20 | September 21 |
| September 22 | September 23 | September 24 |
| September 25 | September 26 | September 27 |
| September 28 | September 29 | September 3 |
| September 30 | September 4 | September 5 |
| September 6 | September 7 | September 8 |
| September 9 | September equinox | Septic shock |
| Septimius Severus | Septoria | Septuagint |
| Septum | Septum primum | Septum secundum |
| Septum transversum | Seqat-ol-Eslam Tabrizi | Seqenenre Tao |
| Sequel | Sequence alignment | Sequence dating |
| Sequence detector | Sequence homology | Sequencing batch reactor |
| Sequential access | Sequential dynamical system | Sequential game |
| Sequential logic | Sequim, Washington | Sequiviridae |
| Sequivirus | Sequoia sempervirens | Sequoiadendron |
| Sequoiadendron giganteum | Sequoioideae | Serabostan |
| Serafín Estébanez Calderón | Seraing | Seram Island |
