- Arveson
- Arveson spectrum
- Arvid Carlsson
- ArVO
- Arvo Salo
- Arvo Turtiainen
- ARWU
- Arxan
- Arxan Shi
- Arxan Thermal Spring
- Aryabhata
- Aryabhata I
- Aryabhata satellite
- Aryabhata Ⅰ
- Aryabhata Ⅰ(476—约550)
- Aryabhatta Research Institute of Observational Sciences
- Aryans
- Arya Samaj
- a ryhme table with excusively rounded or unrounded finals
- arylation
- aryl cation
- aryl ester
- aryl ether
- aryl group
- arylmethane dye