In Mirzapur, five people, including a woman and a child, died when a Dhaka-bound passenger bus and a truck collided head-on in the morning.
Gorai highway police OC Khalilur Rahman Patwari said the accident on the Dhaka-Tangail Highway left two dead on the spot and 15 others injured.
Later, three of the injured people succumbed to their injuries at Kumudini Medical College Hospital, he added.
In Kalihati, a private car hit a motorcycle, killing two motorcyclists were at Analiyabari area.
One of the motorcyclists died on the spot while the other died at Tangail Medical College Hospital, said Bangabandhu east thana Officer-in-Charge Asabur Rahman.
Police identified one of them as Towhid, 27, hailing from Gaibandha.