Cinnamon basil is a type of basil (Ocimum basilicum). The term "cinnamon basil" can refer to a number of different varieties of basil, including as a synonym for Thai basil (O. basilicum var. thyrsiflora), as a particular cultivar of Thai basil,[1] and as a separate cultivar in its own right (i.e., O. basilicum 'Cinnamon').[2][3][4] This article discusses the latter type.