Mibu (壬生町, Mibu-machi^?) is a town located in , , in the northern Kantō region of Japan. As of May 2015, the town had an estimated population of 39,628 and a population density of 649 persons per km². Its total area was 61.06 km².

Mibu is located in south-central .

The remains of many burial mounds from the Kofun period can be found in Mibu. During the Edo period, Mibu-shuku was a post station on a branch the Nikkō Kaidō connecting Edo with the shrines at , and was also a castle town for Mibu Domain. After the Meiji restoration, Mibu town and the villages of Inaba and Minami-Inukai were created within Shimotsuga District on April 1, 1889 with the creation of the municipalities system. Inaba merged with Mibu on November 3, 1954 followed by Minami-Inukai on July 28, 1955.

The economy of Mibu is heavily dependent on agriculture.

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