Ruan Ji (Chinese: 阮籍; pinyin: Ruǎn Jí; 210–263), courtesy name Sizong (Chinese: 嗣宗; pinyin: Sìzōng), was a Chinese musician, poet, and military offier who lived in the late Eastern Han dynasty and Three Kingdoms period of Chinese history. He was one of the Seven Sages of the Bamboo Grove. The guqin melody Jiukuang (酒狂 "Drunken Ecstasy", or "Wine Mad") is believed to have been composed by him. At one time an infantry colonel (步兵校尉), he was also known as Ruan Bubing (阮步兵; pinyin: Ruǎn Bùbīng; literally "Ruan of the infantry").

Ruan Ji had a many-sided personality, but poetry brought him the glory and fame of being the greatest poet of his epoch. Liu Se gave a classical evaluation to the place of poetry in the life of Ruan Ji. Comparing two geniuses of the 3rd century, Ji Kang and Ruan Ji, he wrote: "Ji Kang expressed in his compositions the intellect of an outstanding thinker, Ruan Ji put all his spirit and all his life into his poems.