Yanagisawa Yoshiyasu (柳沢吉保 Yanagisawa Yoshiyasu?) (1658 – 1714) was a Japanese daimyo of the Edo period, who served as an official in the Tokugawa shogunate. He served Tokugawa Tsunayoshi from an early age, becoming his wakashu and eventually rising to the position of soba yōnin. He was the daimyo of the Kawagoe han, and later of the Kofu han; he retired in 1709. Having previously been named Yasuakira, he received a kanji from the name of the shogun, and came to call himself Yoshiyasu. Yanagisawa played a pivotal role in the matter of the 47 Ronin.