Chicago police said the ambulance was stolen from Humboldt Park Health, formerly known as Norwegian American Hospital. As the thief fled, the person struck a cyclist and a car in the 2200-block of West Division Street.
The ambulance then crashed in the 0-100 block of North Avenue. The thief was then taken into custody.
The cyclist took themself to St. Mary Hospital with minor injuries, police said. It was not clear if anyone was injured when the ambulance struck the vehicle.
Charges are pending.