The shooting happened just after 9:30 p.m. Saturday in the 500 block of Rosalie Street in the city's Lawncrest section.
Police say the teen girl was struck in the leg and in the chest.
She was taken to Albert Einstein Hospital listed in stable conditon.
The shooting remains under investigation.
Anyone with information is asked to contact Philadelphia Police at 215-686-TIPS (8477), text a tip to PPD TIP (773847) or through phillypolice.com.