G. Karagiannopoulos (Greek: Γ. Καραγιαννόπουλος) was a Greek shooter. He competed at the 1896 Summer Olympics in Athens. Karagiannopoulos competed in the military rifle event. His time and place are unknown, but he was not among the top 13 in the 42-man competition.
- "G. Karagiannopoulos". Olympedia. Retrieved 21 December 2020.