The first happened inside Lin's grocery on the 2000 block of South 4th Street on November 30th.
Police say the suspect walked in, pulled out a gun, and reached through the cashier window and demanded cash.
Officers believe the same man is responsible for robbing the Southview Pizza on the 300 block of Durfor on December 2nd.
Police are hoping surveillance video will help identify the suspect.
Anyone with information is asked to contact Philadelphia Police.