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The Echizen Dynasty is a hypothetical dynasty in the ancient Japan, advocated by a historan Hidehiro Okada. It is the dynasty following after the Harima dynasty and the Kawachi dynasty. The first Emperor of this dynasty is Keitai. This dynasty is the direct ancestor of the present Royal House of Japan by Okada.
According to the Book of Sui, a Chinese document, which describes the Wakoku , an envoy Pei Shiqing of the Sui Dynasty records that "he met with a male king, who titles himself Ohokimi and has his queen consort and a crown prince" at the time when Empress Suiko and her Regent Prince Shōtoku reigned Japan according to the Nihon Shoki.
Therefore, Okada doubts the existence of Empress Suiko and Prince Shōtoku, and suggests that "there may be another discontinuity in the imperial line between Empress Suiko and Emperor Jomei".