| 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 | Ashin-e Sofla |
| Ashineh | Ashippun, Wisconsin | Ashkam Kuh |
| Ashkan Dejagah | Ashkar Meydan | Ashkum, Illinois |
| Ashland (town), Wisconsin | Ashland City, Tennessee | Ashland County, Wisconsin |
