Ọsanyin (Yoruba: Ọ̀sanyìn, rendered Osaín/Ossain/Ossaím in Latin America, Ague (Age) in Fon)[1] is the orisha who had the omniscient knowledge of leaf, herb and matter.

He is also known for healing and displaying magic and creating technological tools, and is popularly considered as a herbalist, magician, and technologist.

Osanyin is known as a powerful wizard and master of all spells and crafts found in the wild and untamed areas of nature.

[2] In America, he is syncretized with Saint Joseph.

Osanyin is described as embodying the features of leaf and herb, representing healing, curse, magic, knowledge, and many other attributes found within leaf and herb.