| Acheville | Acheville |
| Achgabat | Ashgabat |
| Achicourt | Achicourt |
| Achiet-le-Grand | Achiet-le-Grand |
| Achiet-le-Petit | Achiet-le-Petit |
| Achille | Achilles |
| Achille Alferaki | Achilles Alferaki |
| Achille Castiglioni | Achille Castiglioni |
| Achille Emperaire | Achille Emperaire |
| Achille Lauro | Achille Lauro |
| Achille Liénart | Achille Liénart |
| Achille Talon | Walter Melon |
| Achille van Acker | Achille Van Acker |
| Achille Webo | Pierre Webó |
| Achilleion | Achilleion |
| Achilles Tatius | Achilles Tatius |
| Achillobator | Achillobator |
| achillée | yarrow |
| Achillée millefeuille | Achillea millefolium |
| Achillée sternutatoire | Achillea ptarmica |
| Achim | Achim |
| Achim von Arnim | Ludwig Achim von Arnim |
| Achinoam Nini | Achinoam Nini |
| Achiridae | American sole |
| Achkhabad | Ashgabat |
| Achmiany | Ashmyany |
| Acholique | Acholic |
| Achondrite | Achondrites |
| achondroplasie | achondroplasia |
| Achoura | Day of Ashura |
| Achrafieh | Achrafieh |
| Achromatine | Achromatin |
| achromatique | achromatic |
| achromatisme | achromatism |
| Achrome | White |
| Achromique | Achromic |
| Achtarak | Ashtarak |
| Achzarit | IDF Achzarit |
| Achères-la-Forêt | Achères-la-Forêt |
| achèvement | accomplishment |
| Achéens | Achaeans |
| Achéloos | Achelous |
| Achéménides | Achaemenid Empire |
| Achéménès | Achaemenes |
| Achéron | Acheron |
| Achôris | Hakor |
| Aciclovir | Aciclovir |
| Aciculé | Aciculate |
| Acid Drinkers | Acid Drinkers |
| Acid house | Acid house |
| Acid Pro Loop | ACID Pro |
| Acid techno | Acid techno |
| Acid test | The Electric Kool-Aid Acid Test |
| Acid trance | Acid trance |
| acide | acerbic |
| Acide abscissique | Abscisin |
| acide acétique | acetic acid |
| acide acétylacétique | acetoacetic acid |
| acide acétylsalicylique | acetylsalicylic acid |
| Acide alpha hydroxylé | Alpha hydroxy acid |
| acide aminé | amino acid |
| Acide anhydride | Carbonic acid |
| Acide arachidonique | Arachidonic acid |
| acide ascorbique | ascorbic acid |
| acide azotique | nitric acid |
| acide benzoïque | benzoic acid |
| acide borique | boric acid |
| acide butyrique | butyric acid |
| acide caprique | capric acid |
| acide carbonique | carbonic acid |
| acide carboxylique | carboxylic acid |
| acide chlorhydrique | hydrochloric acid |
| acide chlorique | chloric acid |
| acide citrique | citric acid |
| acide crotonique | crotonic acid |
| Acide de Caro | Peroxymonosulfuric acid |
| Acide de Lewis | Lewis acid |
| Acide dichloroacétique | Dichloroacetic acid |
| acide dilué | diluted acid |
| acide désoxyribonucléique | DNA |
| Acide ellagique | Ellagic acid |
| Acide faible | Weak acid |
| Acide fluoroantimonique | Fluoroantimonic acid |
| Acide fluorosulfurique | Fluorosulfuric acid |
| Acide folinique | Folinic acid |
| acide folique | folic acid |
| acide formique | formic acid |
| Acide fort | Strong acid |
| acide gallique | gallic acid |
| acide gastrique | gastric acid |
| acide gluconique | gluconic acid |
| Acide glucuronique | Glucuronic acid |
| Acide glutamique | Glutamic acid |
| acide gras | fatty acid |
| Acide gras essentiel | Essential fatty acid |
| acide gras saturé | saturated fatty acid |
| Acide halohydrique | Hydrogen halide |
| Acide hexachloroplatinique hexahydraté | Dihydrogen hexachloroplatinate hexahydrate |
| Acide hyaluronique | Hyaluronan |
| Acide iduronique | Iduronic acid |
| Acide kaïnique | Kainic acid |
| Acide lactique | Lactic acid |
| Acide mandélique | Mandelic acid |
| Acide minéral | Mineral acid |
| Acide méthanoïque | Formic acid |
| Acide mévalonique | Mevalonic acid |
| acide nitrique | nitric acid |
| Acide nucléique | Nucleic acid |
| acide nucléïque | nucleic acid |
| acide palmique | ricinoleic acid |
| Acide paratoluènesulfonique | P-Toluenesulfonic acid |
| Acide peracétique | Peracetic acid |
| Acide permanganique | Manganese oxide |
| Acide phosphorique | Phosphoric acid |
| Acide phytique | Phytic acid |
| Acide polylactique | Polylactic acid |
| acide prussique | prussic acid |
| acide ribonucléique | RNA |
| Acide ribonucléique messager | Messenger RNA |
| Acide ribonucléique ribosomique | Ribosomal RNA |
| Acide résinique | Resin acid |
| acide salicylique | salicylic acid |
| Acide stéatique | Fatty acid |
| acide sulfureux | sulfurous acid |
| acide sulfurique | vitriol |
| acide tannique | tannic acid |
| acide tartrique | tartaric acid |
| Acide teichoïque | Teichoic acid |
| Acide trifluoroacétique | Trifluoroacetic acid |
| Acide trifluorométhanesulfonique | Trifluoromethanesulfonic acid |
| acide urique | uric acid |
| Acide uronique | Uronic acid |
| acide valérique | valeric acid |
| Acide α-linolénique | Alpha-linolenic acid |
| Acide γ-linolénique | Gamma-Linolenic acid |
