| Arturo Salah | Arturo Silvestri | Arturo Torres Carrasco |
| Arturo Uslar Pietri | Arturo Vidal | Artvin Province |
| ArtX | Artyom Filiposyan | Aruba |
| Aruban florin | Arum | Arum apulum |
| Arum byzantinum | Arum creticum | Arum cylindraceum |
| Arum cyrenaicum | Arum dioscoridis | Arum discolor |
| Arum elongatum | Arum euxinum | Arum gratum |
| Arum hainesii | Arum hygrophilum | Arum idaeum |
| Arum italicum | Arum jacquemontii | Arum korolkowii |
| Arum maculatum | Arum megobrebi | Arum nigrum |
| Arum orientale | Arum palaestinum | Arum pictum |
| Arum punctatum | Arum purpureospathum | Arum rupicola |
| Arum sintenisii | Arum sooi | Arum trifoliatum |
| Arun Jaitley | Aruna Dindane | Arundel, Quebec |
| Arundhati Roy | Arundo | Arundo donax |
| Arundo formosana | Arundo plinii | Arundo plinni |
| ARV1 | Arvada, Colorado | Arvanaq |
| Arvato services | Arvi Lind | Arvicanthis abyssinicus |
| Arvicanthis niloticus | Arvicolinae | Arvicolini |
| Arvid Carlsson | Arvid Järnefelt | Arvid Thörn |
| Arvin Slagter | Arvo Ylppö | Arvon Township, Michigan |
| Arwa Gouda | Arxan Yi'ershi Airport | ArXiv |
| Arxiv.org | Aryabhata | Aryan |
| Aryan Nations | Aryan race | Aryana Engineer |
| Aryeh Kaplan | Aryl | Arytenoid cartilage |
| Arzachel | Arzew | As |
| AS 15 TT | AS GNN | As Good as It Gets |
| As is | As Long as You Love Me (Justin Bieber song) | AS Monaco |
| AS Monaco FC | As Sayliyah Army Base | As Sirr, Saudi Arabia |
| As the crow flies | As Told by Ginger | As'ad AbuKhalil |
| As(C6H5)3 | As(OH)3 | AS-101 |
| AS-101 (spacecraft) | AS-102 | AS-102 (spacecraft) |
| AS-103 | AS-103 (spacecraft) | AS-104 (spacecraft) |
| AS-105 | AS-105 (spacecraft) | AS-201 |
| AS-202 | AS-203 | As-Sa'iqa |
| As-salamu alaykum | As-Sirāt | As2(CH3)4 |
| As2O3 | As2O5 | As2S3 |
| As2Se3 | ASA 2013 Târgu Mureș | Asa Akira |
| Asa Butterfield | Asa Gray | Asa'ib Ahl al-Haq |
| Asad ibn al-Furat | Asadabad, Abhar | Asadabad, Anar |
| Asadabad, Soltaniyeh | Asadabad, Yazd | Asadabad-e Bala, Yazd |
| Asadabad-e Pain | Asadabad-e Rahnama | Asadi Tusi |
| Asado | Asafa Powell | Asafoetida |
| Asak, Gilan | Asakir-i Mansure-i Muhammediye | Asakir-i Mansure-i Muhammediyye |
| Asaluyeh Rural District | Asami Sanada | Asami Sugiura |
| Asamoah Gyan | Asar, Aligudarz | Asara |
| Asarcornis scutulata | Asaret | Asarum |
| Asarum europaeum | Asarvan | Asashōryū Akinori |
| ASASSN-15lh | Asbab al-nuzul | Asbel Kiprop |
| Asbestos | Asbestos, Quebec | Asbestosis |
| AsBr3 | Asbury, Iowa | Ascanio Sobrero |
| Ascaridida | Ascarina | Ascaris |
| Ascaris lumbricoides | Ascending aorta | Ascending cholangitis |
| Ascending colon | Ascending lumbar vein | Ascending palatine artery |
| Ascension Island | Ascension of Jesus | Ascension Parish, Louisiana |
| Ascertainment bias | Ascetic | Asch. |
| Aschbach, Bas-Rhin | Aschelminthes | Aschiza |
| Aschoff body | Ascidia | Ascidiacea |
| ASCII | ASCII art | ASCII Corporation |
| Ascites | AsCl3 | AsCl5 |
| Asclepiadoideae | Asclepias | Asclepias californica |
| Asclepias cordifolia | Asclepias curassavica | Asclepias eriocarpa |
| Asclepias fruticosa | Asclepias purpurascens | Asclepias solanoana |
| Asclepias syriaca | Asclepias tuberosa | Asclepias verticillata |
| Ascobolaceae | Ascobolus | Ascobolus americanus |
| Ascobolus bohemicus | Ascobolus brunneus | Ascobolus carbonicola |
| Ascobolus cervinus | Ascobolus coronatus | Ascobolus denudatus |
| Ascobolus difformis | Ascobolus elegans | Ascobolus foliicola |
| Ascobolus hyperboreus | Ascobolus persoonii | Ascobolus psittacinus |
| Ascobolus terrestris | Ascobolus ursinus | Ascobolus violascens |
| Ascobolus xylophilus | Ascomycota | Ascona |
| Ascophyllum | Ascophyllum nodosum | Ascorbate |
| Ascorbic acid | Ascorbyl palmitate | Ascot Corner, Quebec |
| Ascoviridae | Ascovirus | Ascros |
| Asda Story | ASEAN | ASEC Mimosas |
| Aseel Omran | Aselizumab | Asellia tridens |
| Asemeia violacea | Asemia | Asenath |
| Asepsis | Aseptic meningitis | Aseroë |
| Aseroë actinobola | Aseroë arachnoidea | Aseroë calathiscus |
| Aseroë coccinea | Aseroë corrugata | Aseroë floriformis |
| Aseroë genovefae | Aseroë hookeri | Aseroë junghuhnii |
| Aseroë lysuroides | Aseroë muelleriana | Aseroë multiradiata |
| Aseroë pallida | Aseroë pentactina | Aseroë poculiformis |
| Aseroë rubra | Aseroë viridis | Aseroë zeylanica |
| Aseroe | Aseroe actinobola | Aseroe arachnoidea |
| Aseroe calathiscus | Aseroe coccinea | Aseroe corrugata |
| Aseroe floriformis | Aseroe genovefae | Aseroe hookeri |
| Aseroe lysuroides | Aseroe muelleriana | Aseroe multiradiata |
| Aseroe poculiformis | Aseroe zeylanica | Asexuality |
| Asfarviridae | Asfyj Rural District | Asgaran, Lorestan |
| Asgarlu | Asghar Farhadi | Asgharabad, Qazvin |
| Ash (analytical chemistry) | Ash Flat, Arkansas | Ash heap of history |
| Ash Township, Michigan | Ash Wednesday (poem) | Ash'ari |
| Ash-shab yurid isqat an-nizam | AsH3 | Asha 205 |
| Asha 206 | Asha 302 | Asha 501 |
| Asha Haji Elmi | Ashanti (singer) | Asharoken, New York |
| Ashaway, Rhode Island | Ashburn, Georgia | Ashby, Minnesota |
| Ashden | Ashdown, Arkansas | Asher Ginsberg |
| Asherah | Asherman's syndrome | Ashford, Wisconsin |
| Ashgabat | Ashik | Ashin-e Olya |
