40 people were also injured in the incident, which occurred on Friday morning, August 5.
Many of the injured are in critical condition and some of them have been shifted to the Intensive Care Unit (ICU), local media reported.
The inferno started at about 1 a.m. as customers packed the Mountain B pub.
Among the dead, rescuers found the charred bodies of at least nine men and four women from the men’s toilets and the DJ area.
Crucial videos from the scene show people running for safety and screaming as flames and smoke billowed from the building.
Meanwhile, Pol Col Wuttipong Somjai, police chief of Phlu Ta Luang, told media that the Mountain B pub was located on Sukhumvit Road in Sattahip district, adding that all the victims were believed to be Thai nationals.
An eyewitness said he heard two explosions near the DJ booth and later the fire engulfed the entire pub due to the soundproofing foam used on the roof.
Also, 26-year-old pub supervisor Thanyapat Sornsuwanhiran said she saw the flame on the roof of the bar and added she guided customers to get out of the fire-engulfed area.
Chon Buri police commander Pol Major General Atthasit Kitjahan said the pub was started around a month ago and was popular among the youth and the local people.
He added that the reason for the Thailand night club fire is under investigation.
Watch a video from the scene below.
— gelos.in (@gelos_in) August 5, 2022