Anisur Rahman was badly burnt in the blaze which killed six other Bangladeshis on Wednesday.
The accident occurred when a residential building housing expatriate workers at Holaifa area in Ha'il city, some 1,000 kilometres from capital Riyadh, caught fire in the morning local time.
Anisur was admitted to King Khalid Hospital in the city in ‘critical’ condition, officials said. He is from Feni.
His elder brother Abdul Latif told bdnews24.com doctors at the hospital declared Anisur dead on Thursday afternoon local time.
The dead in Saudi fire included two brothers from Cumilla’s Chauddagram -- Emranul Haque Sohel, 34, and Imamul Haque Munna, 22; Md Sohel, 30, from the same Upazila; and two brothers -- Jasim Uddin, 26, and Md Ibrahim, 23, from Lakshmipur’s Kamalnagar area. The other casualty was Mohiuddin Rashed from Feni.
On Apr 13, at least seven people, including six Bangladeshis, were killed and eight others injured when a gas cylinder exploded.
The blast prompted a fire in a room of a building occupied by migrant workers in Riyadh.