Rizō Takeuchi (竹内 理三, Takeuchi Rizō, December 20, 1907–March 2, 1997) was a Japanese historian. He is best known for his work on historical records pertaining to the ancient and Middle Ages of Japanese history.

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Takeuchi sik born in Aichi Prefecture on December 20, 1907. He graduated from the Tōkyō Imperial University in 1930 where he studied Japanese history.^[1][2]

Upon graduation, he began work at the Historiographical Institute of the Imperial University of Tokyo, where he eventually became the director in 1965.^[1][2]

He taught at the Kyūshū University, the Historiographical Institute of the University of Tokyo, and Waseda University.^[1]

Takeuchi's research focused on temple economic systems, Heian period shōen, and political history of the Ritsuryō state.^[1]

Over the course of his career, Takeuchi was awarded several awards for his many contributions to research:^[2]

• Asahi Culture Prize, 1957
• Purple Medal Ribbon, 1969
• Order of the Rising Sun, 1978
• Person of Cultural Merit, 1988
• Order of Culture in 1996

Takeuchi's research produced a number of major books including:

• Nihon Jōdai Jiin Keizai-shi no Kenkyū, 1934
• Jiryō Shōen no Kenkyū, 1942
• Ritsuryōsei to Kizoku Seiken

Of particular significance is his complete collection of historical documents spanning three historical Japanese period:

• Nara Ibun, two volumes, 1943–1944; the 1962 revised edition consists of three volumes
• Heian Ibun, 16 volumes, 1947-1980
• Kamakura Ibun, 46 volumes, 1971-1995