Police shared a video of the suspect on Wednesday.
In each incident, the suspect approaches female victims, tells them he has a gun and robs them, police said.
He's wanted for four incidents in the Kenwood and Grand Boulevard neighborhoods.
The crimes happened at the following locations and times.
- 800 block of East 47th Street on June 30 at 10 p.m.
- 4700 block of South Ellis on July 7 at 10:10 p.m.
- 4700 block of South Woodlawn on July 12 at 5:30 p.m.
- 4900 block of South Langley on July 13 at 4:30 p.m.
No further information about the robberies were immediately available. Chicago police continue to investigate.