Takeuchi Seihō was a Japanese painter of the Nihonga genre, active from the Meiji through the early Shōwa period. One of the founders of nihonga, his works spanned half a century and he was regarded as master of the prewar Kyoto circle of painters. His real name was Takeuchi Tsunekichi .

Nihonga is a Japanese style of painting that uses mineral pigments, and occasionally ink, together with other organic pigments on silk or paper. The term was coined during the Meiji period (1868–1912) to differentiate it from its counterpart, known as Yōga (洋画) or Western-style painting. The term literally translates to "pictures of Japan."