The accident happened around 8:45pm on Wednesday.
The deceased, identified as Sumon, was a resident of Debidwar upazila in Cumilla district.
According to witnesses, the accident occurred when a Dhaka-bound Asha Paribahan bus from Cumilla lost control and hit the road divider at Pakhir More, causing it to overturn.
Bhaberchar Highway Police Acting In-Charge Harunar Rashid said police have taken custody of the deceased passenger's body and his family has been informed.
The bus involved in the crash has been seized, but the driver fled the scene. "Legal action is underway," he added.
Passengers on board said the bus lost control suddenly before crashing into the divider and overturning.
Gazaria Fire Service Station Officer Rifat Mallick said two fire service units were deployed to the site and all injured passengers were sent to Gazaria Health Complex for medical care, reports UNB.
Ashraful Alam Shuvo, a doctor at the emergency department of Gazaria Upazila Health Complex, said that 12 people injured in the road accident were brought to the hospital after 9pm. Of them, eight were referred to Dhaka.