Police say the victims were outside in the 2000 block of East 71st Street around 11:55 a.m. when a dark-in-color sedan drove past and fired shots at them.
The adult victim, a 28-year-old man, was shot in his right arm and abdomen. He was transported to University of Chicago Medical Center in serious condition.
The 16-year-old victim suffered a gunshot wound to his right leg. He was transported to Comers Children's Hospital in stable condition.
No one is in custody. Area One Detectives are investigating the shooting.