In each incident, the robbers implied they had weapons, according to CPD.
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All three of the robberies happened in the Loop. Two were on the same block of Michigan Avenue.
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Two happened at 7 and 7:30 p.m. Saturday in the 0- to 100-block of South Michigan Avenue, and one happened at 6 p.m. Sunday in the 200-block of East Randolph Street, police said.
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The suspects are described as male and female and 15 to 25 years old.
Anyone with information is asked to call Area Three detectives at 312-744-8263.