Shōnai (庄内町 Shōnai-machi) was a town located in Kaho District, Fukuoka, Japan.
On March 26, 2006 Shōnai, along with the towns of Chikuho, Honami and Kaita, all from Kaho District, was merged into the expanded city of Iizuka.
As of 2003, the town had an estimated population of 10,980 and a density of 427.40 persons per km². The total area was 25.69 km².