Diö is a locality situated in Älmhult Municipality, Kronoberg County, Sweden with 910 inhabitants in 2010.
Diö is situated 10 km north of the town Älmhult.
Diö's largest employer is the wheelchair manufacturer Rea Stolen Invacare. The area is also home to the Gemla Möbel AB furniture factory.
Diö Hockey, who play in the Swedish third division, are the village's most famous sports side.