Local officials said another 15 people were injured in the blast that targeted a café on Wednesday night, presstv.ir reported.
Following the attack, security services imposed a curfew in the region, the Iraqi News website reported.
According to the United Nations Assistance Mission in Iraq (UNAMI), 196 civilians were killed, while another 381 were injured due to violence and armed conflicts in September.
No group has claimed responsibility for the blast which has the hallmarks of the Daesh terrorist group.
Daesh unleashed a campaign of death and destruction in Iraq in 2014, seizing Mosul and declaring it as its so-called “capital” in the Middle Eastern state.
Iraqi army soldiers and allied fighters have been leading a major campaign to rid the country of the Takfiri elements.
The Iraqi forces fully liberated Mosul in July. They are now engaged in counter-terrorism operations elsewhere in the country.