A car packed with explosives blew up near car dealerships in the Shia area of Bayaa in the south of the city. More than 50 people were injured.
The Islamic State (IS) group claimed the attack, saying it targeted "a gathering of Shias".
At least 24 people were killed in other attacks on Tuesday and Wednesday.
An AFP reporter at the scene of Thursday's bomb reported seeing numerous burnt-out vehicles, and blood on the ground.