The fire broke out at around 1 am at the Mountain B nightclub, a one-story building in the Sattahip district of Chonburi province, southeast of Bangkok, police said.
Sattahip is about 30 kilometers south of Pattaya City, a popular tourist destination.
Police Colonel Wuttipong Somjai told CNN that the fire took place during a live music performance.
He said burn injuries ranged from “mild to serious,” and an investigation into the cause of the fire is ongoing.
All victims were Thai nationals, he said.
This is a developing story