There was no immediate claim of responsibility for the blast in al-Radwaniya district, which wounded at least 25 others, Reuters reported.
The Daesh (ISIL) militants battling the Iraqi troops in the north and west have regularly targeted Shiite areas in the capital.
The suicide attack came a day after a series of bomb explosions and a shooting attack at residential neighborhoods in and around Baghdad claimed the lives of at least eight people and injured more than two dozen others.
The United Nations Assistance Mission for Iraq says a total of 1,119 Iraqis were killed and another 1,561 wounded in acts of terrorism, violence and armed conflict in March.
According to the UN mission, the number of civilian fatalities stood at 575. Violence also claimed the lives of 544 members of the Iraqi security forces.
A great portion of the fatalities was recorded in Baghdad, where 259 civilians were killed.
Gruesome violence has plagued the northern and western parts of Iraq since Daesh terrorists launched an offensive in June 2014, and took control of portions of the Iraqi territory.
The militants have been committing heinous crimes against all ethnic and religious communities in Iraq, including Shiites, Sunnis, Kurds, and Christians. Iraqi army soldiers and fighters from allied Popular Mobilization Units are seeking to win back militant-held regions in joint operations.