| Arenco | Arend Bengtsson (Ulv) | Arend Dijckman |
| Arend Friedrich August Wiegmann | Arend Lijphart | Arend Nordin |
| Arend Pinnow | Arend Styke | Arend Versteegh |
| Arend Vilhelm Nordin | Arend-Roland-kometen | Arend-Rolands komet |
| Arendal | Arendal (stad) | Arendal kommun |
| Arendal, Göteborg | Arendal, Norge | Arendala |
| Arendala (hållplats) | Arendals båtvarv | Arendals kommun |
| Arendalsbanan | Arendalsbanen | Arendalsuka |
| Arendalsvarvet | Arendalsvassdraget | Arendalsveckan |
| Arendiska Inbördeskriget | Arendonck | Arendonk |
| Arendonk (församling) | Arendonk (kommun i Belgien) | Arendonk (ort) |
| Arendorff, Victor | Arends stenografisystem | Arends system |
| Arends' system | Arends, Leopold Alexander Friedrich | Arends-Eiland |
| Arendsee | Arendsee (Altmark) | Arendsee (sjö) |
| Arendt de Jounge | Arendt de Roy | Arendt Dreijer |
| Arendt Dubois | Arendt Grape | Arendt Lamprechts |
| Arendt Pehrsson | Arendt Pehrsson (Örnflycht) | Arendt Pehrsson Örnflycht |
| Arendt Persson | Arendt, Hannah | Arendt, Helga |
| Arendt, Martin Friedrich | Arendt, Rudolf | Arendt, Theodor |
| Arene | Arene (snäcksläkte) | Arene adusta |
| Arene bairdii | Arene balboai | Arene brasiliana |
| Arene briareus | Arene carinata | Arene cruentata |
| Arene ferruginosa | Arene fricki | Arene lucasensis |
| Arene miniata | Arene riisei | Arene stellata |
| Arene tricarinata | Arene variabilis | Arene venusta |
| Arene venustula | Arene, Emmanuel | Arene, Paul |
| Arenenberg | Arener | Arenetra |
| Arenetra agrotidis | Arenetra autumnalis | Arenetra canadensis |
| Arenetra criddlei | Arenetra favonii | Arenetra fumipennis |
| Arenetra genangusta | Arenetra hirsutula | Arenetra leucotaenia |
| Arenetra nigrita | Arenetra occulta | Arenetra pallidipes |
| Arenetra pallipes | Arenetra pilosella | Arenetra rufipes |
| Arenetra tenuis | Arenetra ventralis | Arenetra vernalis |
| Arenga | Arenga ambong | Arenga australasica |
| Arenga borneensis | Arenga brevipes | Arenga caudata |
| Arenga distincta | Arenga engleri | Arenga gamuto |
| Arenga gracilicaulis | Arenga griffithii | Arenga hastata |
| Arenga hookeriana | Arenga listeri | Arenga longicarpa |
| Arenga longipes | Arenga micrantha | Arenga microcarpa |
| Arenga microcarpa keyensis | Arenga mindorensis | Arenga nana |
| Arenga obtusifolia | Arenga pinata | Arenga pinnata |
| Arenga plicata | Arenga porphyrocarpa | Arenga retroflorescens |
| Arenga ryukyuensis | Arenga saccharifera | Arenga talamauensis |
| Arenga tremula | Arenga tremula engleri | Arenga undulatifolia |
| Arenga westerhoutii | Arenga wightii | Arengosse |
| Arengus sagax | Arenhill, Åke | Arenhold Lüger |
| Areni | Arenia cruenta | Arenia fragilis |
| Arenichthys apterus | Arenicola | Arenicola (pteroscolex) antillensis |
| Arenicola assimilis | Arenicola bobretzkii | Arenicola boeckii |
| Arenicola bombayensis | Arenicola branchialis | Arenicola brasiliensis |
| Arenicola bucci | Arenicola caroledna | Arenicola claparedii |
| Arenicola cristata | Arenicola cyanea | Arenicola defodiens |
| Arenicola dioscurica | Arenicola dorvilliana | Arenicola ecaudata |
| Arenicola glacialis | Arenicola glasselli | Arenicola grubii |
| Arenicola loveni | Arenicola marina | Arenicola montagui |
| Arenicola nodosa | Arenicola pusilla | Arenicolidae |
| Arenicolides | Arenicolides branchialis | Arenicolides ecaudata |
| Arenicolides ecaudatus | Arenicolides grubii | Areniella filiformis |
| Arenifera | Arenifera pillansii | Arenifera pungens |
| Arenifera spinescens | Arenifera stylosa | Arenig Fach |
| Arenig Fawr | Arenigena | Arenigena brunnea |
| Arenigena marcida | Arenigena semitaria | Arenigobius |
| Arenigobius bifrenatus | Arenigobius frenatus | Arenigobius leftwichi |
| Arenigobius tamarensis | Arenillas | Arenillas (kommun i Spanien) |
| Arenillas de Ríopisuerga | Arenillas de Riopisuerga | Arenillas de Riopisuerga (kommun i Spanien) |
| Arenipses | Arenipses sabella | Areniscythris |
| Areniscythris brachypteris | Arenite Ridge | Arenius, Joakim |
| Arenius, Olof | Arenivaga | Arenivaga apacha |
| Arenivaga bolliana | Arenivaga erratica | Arenivaga floridensis |
| Arenivaga genitalis | Arenivaga grata | Arenivaga infuscata |
| Arenivaga investigata | Arenivaga rehni | Arenivaga tonkawa |
| Arenlind, Martin | Arenobius | Arenobius manegitus |
| Arenobius sontus | Arenobufagin | Arenocaris |
| Arenocaris bifida | Arenochalina arabica | Arenochalina mirabilis |
| Arenochroa | Arenochroa flavalis | Arenocoris |
| Arenocoris fallenii | Arenodiplosoma migrans | Arenolaophonte |
| Arenolaophonte stygia | Arenoledra | Arenoledra nigrifrons |
| Arenoledra nigrimaculata | Arenoledra ochracea | Arenoledra tubularis |
| Arenomydas | Arenomydas aridicolus | Arenomydas bunochilus |
| Arenomydas caerulescens | Arenomydas callosus | Arenomydas lightfooti |
| Arenomydas namaquensis | Arenomydas niger | Arenomydas partitus |
| Arenomydas pleurostictus | Arenomydas sentipes | Arenomydas thorni |
| Arenonemertes | Arenonemertes arenicola | Arenonemertes arenicolus |
| Arenonemertes microps | Arenonemertes minuta | Arenonemertes minutus |
| Arenophilus | Arenophilus bipuncticeps | Arenophilus osborni |
| Arenophilus peregrinus | Arenophilus psednus | Arenophilus rotarius |
| Arenophilus unaster | Arenophilus watsingus | Arenophryne |
| Arenophryne rotunda | Arenophryne xiphorhyncha | Arenopolis |
| Arenopontia | Arenopontia acantha | Arenopontia accraensis |
| Arenopontia africana | Arenopontia arenarida | Arenopontia australis |
| Arenopontia biarticulata | Arenopontia breviarticulata | Arenopontia dillonbeachia |
| Arenopontia gussoae | Arenopontia indica | Arenopontia intermedia |
| Arenopontia ishikariana | Arenopontia longiremis | Arenopontia nesaie |
| Arenopontia orientalis | Arenopontia pontica | Arenopontia problematica |
| Arenopontia riedli | Arenopontia secunda | Arenopontia spinicaudata |
| Arenopontia stygia | Arenopontia subterranea | Arenopontiidae |
| Arenor i Olympiska sommarspelen 2008 | Arenor i paralympiska sommarspelen 2008 | Arenor vid olympiska sommarspelen 2016 |
| Arenor vid olympiska vinterspelen 2010 | Arenor vid olympiska vinterspelen 2018 | Arenor vid olympiska vinterspelen 2022 |
| Arenosclera | Arenosclera arabica | Arenosclera brasiliensis |
| Arenosclera digitata | Arenosclera heroni | Arenosclera parca |
