Ōmizo Domain

The Ōmizo Domain (大溝藩, Ōmizo-han) was a Japanese domain of the Edo period, located in Ōmizo, Ōmi Province (modern-day Takashima city, Shiga Prefecture). It was ruled for the entirety of its history by the Wakebe clan.

The last lord, Mitsunori, is considered by some to be the last surviving daimyo. Mitsunori became family head as an infant, and in the short interval when daimyo had already lost their titles and been made han chiji (藩知事), or "domainal governors." These circumstances lead others to consider Hayashi Tadataka of the Jōzai Domain to have been last surviving daimyo; although Hayashi died before Mitsunori, he had actually been a daimyo in the historic sense.