Mitsuo Aida (?????, Aida Mitsuo, 20 May 1924 – 17 December 1991) was a Japanese poet and calligrapher known as The Poet of Zen.
His work was influenced by Zen Buddhism and he is known for his works, Ningen damono (Because I'm Human), Okagesan (Our Debt to Others), and Inochi ippai (Live a Full Live).