| accis | excise |
| accistjänsteman | customs officer |
| Acción Popular | Popular Action |
| Accra | Accra |
| Accumbenskärnan | Nucleus accumbens |
| Accumulator | Battery |
| Accuphase | Accuphase |
| Accuracy International Arctic Warfare | Accuracy International Arctic Warfare |
| ACD | Automatic call distributor |
| Ace Attorney | Ace Attorney |
| Ace of Base | Ace of Base |
| Ace the Bat-Hound | Ace the Bat-Hound |
| Aceh | Aceh |
| Acer | Acer |
| Acesulfamkalium | Acesulfame potassium |
| Acetaldehyd | Acetaldehyde |
| acetamid | acetamide |
| acetat | acetate |
| aceton | acetone |
| Acetonperoxid | Acetone peroxide |
| acetyl | acetyl |
| Acetyl-CoA | Acetyl-CoA |
| acetylen | acetylene |
| Acetylkolin | Acetylcholine |
| acetylkolinesteras | acetylcholinesterase |
| acetylkolinklorid | acetylcholine chloride |
| acetylsalicylsyra | acetylsalicylic acid |
| ACF Fiorentina | ACF Fiorentina |
| Achaea | Achaea |
| Achaguas | Achaguas |
| Achaia | Achaea |
| Achaimenes | Achaemenes |
| Achaios | Achaeus |
| Achaios från Eretria | Achaeus of Eretria |
| Achaiska förbundet | Achaean League |
| Achal | Ahal Province |
| Achalkalaki | Akhalkalaki |
| Achaltekeer | Akhal-Teke |
| Acheiropoieton | Acheiropoieta |
| Achel | Achel Brewery |
| Acheloos | Acheloos River |
| Achelous | Achelous |
| Achelousaurus horneri | Achelousaurus |
| Achern | Achern |
| Acheron | Acheron |
| Acheuléenkulturen | Acheulean |
| Achill | Achill Island |
| Achilles | Achilles |
| Achillobator giganticus | Achillobator |
| Achim von Arnim | Ludwig Achim von Arnim |
| Achird | Eta Cassiopeiae |
| Achmat Kadyrov | Akhmad Kadyrov |
| Acholi | Acholi |
| acid | acid |
| Acid folk | Psych folk |
| Acid house | Acid house |
| Acid trance | Acid trance |
| aciditet | acidity |
| acidos | acidosis |
