Hiraiwa Chikayoshi (平岩 親吉, 1542 – February 1, 1611) was a Japanese daimyō of the early Edo period. He ruled the Inuyama Domain. According to legend, he was involved in a 1611 plot by Tokugawa Ieyasu to assassinate Toyotomi Hideyori, son and intended successor of Toyotomi Hideyoshi, through use of a poisoned manjū. Though the story has been historically discounted, it remains immortalized in a kabuki play.

In 1576, he assassinate Mizuno Nobumoto, on the order of Tokugawa Ieyasu, who in turn instructed the assassination on the base that Nobumoto were conspiring with the enemies.^[1]

• Turnbull, Stephen (1998). The Samurai Sourcebook. London: Cassell & Co.