A
- Allium aaseae: South Idaho Onion
- Allium abdelkaderi
- Allium ablyanthum
- Allium ablyanthum var. striolatum
- Allium abramsii (synonym of Allium fimbriatum var. abramsii) : Abrams' Allium
- Allium achaium
- Allium acidoides
- Allium aciphyllum
- Allium acre
- Allium acuminatum: Tapertip Onion
- Allium adzharicum
- Allium aegaeum
- Allium aegilicum
- Allium aemulans
- Allium aestivale
- Allium aethusanum
- Allium afghanicum
- Allium aflatunense
- Allium agrigentinum
- Allium aitchisoni
- Allium akaka
- Allium alabasicum
- Allium alaicum
- Allium alaschanicum
- Allium alataviense
- Allium albanum
- Allium alberti
- Allium albidum
- Allium albiflorum
- Allium albo-tunicatum
- Allium albopilosum
- Allium albostellerianum
- Allium alexandrae
- Allium alibile
- Allium allegheniense
- Allium alpicolum
- Allium alpinarii
- Allium altissimum
- Allium altyncolicum
- Allium amabile
- Allium amamianum
- Allium ambiguum
- Allium amblyanthum
- Allium amethystinum var. antiquorum
- Allium ampeloprasoides
- Allium ampeloprasum: (Broadleaf) Wild Leek
- Allium ampeloprasum f. scaberrimum
- Allium ampeloprasum subsp. truncatum
- Allium ampeloprasum f. urceolatum
- Allium amphibolum
- Allium amphipulchellum
- Allium amplectens (synonym of Allium attenuifolium) : Narrowleaf Onion
- Allium anacoleum
- Allium anatolicum
- Allium anceps : Twinleaf onion
- Allium andicolum
- Allium angolense
- Allium angulare
- Allium angulosum : Mouse Garlic
- Allium angustum
- Allium anisopodium ssp. argunense
- Allium anisotepalum
- Allium anserinum
- Allium antiatlanticum
- Allium antoniani
- Allium anzalonei
- Allium aobanum
- Allium apulum
- Allium archeotrichon
- Allium arenicola
- Allium argyi
- Allium aridum
- Allium aristatum
- Allium arkitense
- Allium arlgirdense
- Allium armerioides
- Allium aroides
- Allium artemisietorum
- Allium artvinense
- Allium asarense
- Allium ascalonicum : Shallot
- Allium aschersonianum
- Allium asclepiadeum
- Allium asirense
- Allium asperiflorum
- Allium assadii
- Allium assimile
- Allium atlanticum
- Allium atriphoeniceum
- Allium atropurpureum (synonym of Allium stenopetalum) : Purple-flowered onion
- Allium atrorubens : Darkred Onion
- Allium atrosanguineum
- Allium attenuatum
- Allium attenuifolium
- Allium aucheri
- Allium auctum
- Allium auriculatum
- Allium austrokyushuense
- Allium austrosibiricum
- Allium autumnale
- Allium azaurenum
- Allium azutavicum
Read more about this topic: List Of Allium Species