All seven victims were men in their 20s or 30s, and all were shot to death.
The shootings occurred between 6:15 a.m. Saturday and just before 6 a.m. Sunday.
One victim, 30-year-old Demond Stansbury, was shot along with two of his cousins, who survived and are in fair condition.
The shootings spanned the city, happening on the North, South and West sides.
Chicago Police spokesman Roderick Drew says investigations into the shootings are ongoing.
On Saturday, police Superintendent Jody Weis spoke at an anti-violence march and rally on the West side.