Nakaizu (中伊豆町, Nakaizu-chō) was a town located in Tagata District, Shizuoka Prefecture, Japan, in central Izu Peninsula.

Nakaizu 中伊豆町
Former municipality
Flag Seal
Nakaizu Location in Japan
Coordinates: 34°56′56″N 138°59′56″E / 34.9490°N 138.9990°E / 34.9490; 138.9990
Country	Japan
Region	Chūbu (Tōkai)
Prefecture	Shizuoka Prefecture
District	Tagata
Merged	April 1, 2004 (now part of Izu)
Area
• Total	102.02 km2 (39.39 sq mi)
Population  (March 1, 2005)
• Total	8,457
• Density	77/km2 (200/sq mi)
Time zone	UTC+09:00 (JST)

As of March 1, 2004, final population data before the amalgamation, 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.

On April 1, 2004, Nakaizu, along with the towns of Amagiyugashima, Shuzenji and Toi (all from Tagata District), was merged to create the city of Izu.

Nakaizu, located in the Izu-Kogen highlands of central Izu Peninsula was noted for its production of wasabi and shiitake.