C
- Allium cabulicum
- Allium caerulescens
- Allium caeruleum
- Allium caesioides
- Allium caesium
- Allium caespitosum
- Allium calamarophilon
- Allium calcareum
- Allium californicum
- Allium callidyction
- Allium callimischon ssp. haemostictum
- Allium calocephalum
- Allium calyptratum
- Allium campanulaeflorum
- Allium campanulatum: Dusky Onion
- Allium canadense: Meadow Garlic; Wild Garlic
- Allium candargyi
- Allium candolleanum
- Allium cannaefolium
- Allium capitellatum
- Allium cappadocicum
- Allium caput-medusae
- Allium cardiostemon
- Allium caricoides
- Allium carinatum: Keeled Garlic
- Allium carinatum ssp. biokovense
- Allium carmeli
- Allium caroli-henrici
- Allium carolinianum
- Allium cascadense
- Allium caspium
- Allium cassium
- Allium cathodicarpum
- Allium cepa : garden onion
- Allium cepa var. australiorientale
- Allium cepa var. boreale
- Allium cepa var. borealiamericanum
- Allium cepa var. medieuropeum
- Allium cepa var. medirossicum
- Allium cepa ssp. orientale
- Allium cernuum: Nodding Onion; Wild Onion; Lady's Leek
- Allium chalcophengos
- Allium chalkii
- Allium chamaemoly
- Allium chamaemoly ssp. longicaulis
- Allium chamaespathum
- Allium chamarense
- Allium chaneti
- Allium chanetii
- Allium changduense
- Allium charadzeae
- Allium charaulicum
- Allium chauveli
- Allium chelotum
- Allium chevsuricum
- Allium chienchuanense
- Allium chilense
- Allium chinense (synonym of Allium odorum) : rakkyo
- Allium chitralicum
- Allium chiwui
- Allium chloroneurum
- Allium chodsa-bakirganicum
- Allium choriotepalum
- Allium christii
- Allium christophii (?): Star of Persia; Persian Onion
- Allium chrysantherum
- Allium chrysanthum
- Allium chrysocephalum
- Allium chrysonemum
- Allium ciliatum
- Allium cilicicum
- Allium circassicum
- Allium circinnatum
- Allium circinatum ssp. peloponnesiacum
- Allium circumflexum
- Allium cirrhosum
- Allium cisferganense
- Allium clarkei
- Allium clathratum
- Allium clausum
- Allium colchicifolium
- Allium collinum
- Allium collis-magni
- Allium compactum
- Allium columbianum (basionym of Allium douglasii Wood var. columbianum ): Columbian onion
- Allium condensatum
- Allium confragosum
- Allium confusum
- Allium consanguineum
- Allium constrictum (basionym of Allium douglasii Wood var. constrictum) : Grand Coulee Onion
- Allium convallarioides
- Allium cornutum
- Allium corsicum
- Allium coryi : Yellowflower Onion
- Allium costatovaginatum
- Allium crameri
- Allium cratericola: Cascade Onion
- Allium crenulatum'': Olympic Onion
- Allium crispum: Crinkled Onion
- Allium cristatum
- Allium cristophii
- Allium croceum
- Allium crystallinum
- Allium cucullatum
- Allium cupani
- Allium cupani ssp. anatolicum
- Allium cupani ssp. cyprium
- Allium cupani var. minoricensis
- Allium cupuliferum
- Allium cupuliferum ssp. nuratavicum
- Allium curtum
- Allium cusickii
- Allium cuspidatum
- Allium cuthbertii: Striped Garlic
- Allium cyaneum
- Allium cyathophorum
- Allium cyclospathum
- Allium czelghauricum
Read more about this topic: List Of Allium Species