Yoshii (吉井町 Yoshii-chō) was a town located in Akaiwa District, Okayama, Japan.
On March 7, 2005 Yoshii was merged with the towns of Akasaka, Kumayama and San'yō, all from Akaiwa District, to form the new city of Akaiwa.
As of 2006, the town had an estimated population of 5,386 and a density of 62.58 persons per km² and 1,963 families. The total area was 86.07 km².
Yoshii’s main farm products are rice, cucumbers, grapes and garlic chives. Yoshii’s total agricultural production was valued 690 million yen in 2001.
There is a junior high school and two elementary schools in Yoshii.
The Osuwa festival is held every August in Yoshii. Many people come to this festival from different places to enjoy traditional Japanese dancing.