Jidayu Koizumi
Statue of Jidayu Koizumi
Lord	Imagawa Ujizane (until 1615) Tokugawa Ieyasu (after 1615)
Born	1539 (1539)
Died	January 27, 1624(1624-01-27) (aged 84–85)
Era name and dates Shogunate: Tokugawa
Clans	Uematsu → Koizumi (renamed)

Jidayu Koizumi (小泉次大夫, 1539 - 1624 January 27) was the Secretary of Water and Hatamoto magistrate of the early Edo period.