The 2007 Chicago Marathon was the 30th running of the annual marathon race in Chicago, United States and was held on October 7. The elite men's race was won by Kenya's Patrick Ivuti in a time of 2:11:11 hours and the women's race was won by Ethiopia's Berhane Adere in 2:33:49.

A participant in the 2007 Chicago Marathon, Chad Schieber of Michigan, died suddenly while attempting to finish the race. His death was brought on by complications involving his previous diagnosis of mitral valve prolapse.

The race, which had started at 8am, was stopped by 11.30am, with runners calling for emergency help, more than 300 needing picking up by ambulance suffering from nausea, heart palpitations and dizziness from the stifling heat, and 49 requiring hospitalisation.^[1]