Nakaizu (中伊豆町, Nakaizu-chō?) was a town located in Tagata District, Shizuoka, Japan, in central Izu Peninsula.
On April 1, 2004 Nakaizu was merged with the towns of Amagiyugashima, Toi and Shuzenji, all from Tagata District, to form the new city of Izu.
As of March 1, 2004 (the final population data before the amagalation), the town had an estimated population of 8,457 and a density of 77.03 persons per km². The total area was 110.02 km².
Nakaizu, located in the Izu-Kogen highlands of central Izu Peninsula is noted for its production of wasabi and shiitake.