Ujii Yashirō (雲林院 弥四郎, 1581 - 1669) was a retainer under the Japanese Hosokawa clan during the Edo period (17th century).
Tadatoshi had, at one time, wanted for Yashiro to duel against the famous swordsman, Miyamoto Musashi.
Musashi had hesitated when hearing this, because Ujii had precedence of rank over him within the fief and had the status of master.
After the two adepts had fought for three rounds, even though Musashi had made not attacks, Yashiro was unable to defeat him.
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