The boy, who was not identified, faces a first-degree murder charge in connection with the fatal Englewood shooting.
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He was arrested in the 100-block of East Chicago Avenue Wednesday after being identified as one of the suspects involved in the incident, Chicago police said.
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About 4:20 p.m. Aug. 19, 23-year-old Keewaan Crayton was on a Red Line train traveling in the 200-block of West Garfield Boulevard when three people approached him and one of them fired shots, Chicago police said at the time.
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Crayton was struck in the arm and taken to the University of Chicago Medical Center, where he died, police said.
Area One detectives are investigating.
Sun-Times Media contributed to this report.