Korean clan from South Jeolla Province
Hampyeong O clan (Korean: ; Hanja: ) was one of the Korean clans. Their Bon-gwan was in Hampyeong County, South Jeolla Province. According to the research in 2000, the number of Hampyeong O clan was 2845. Their founder was O Jam. O Jam was a 4th son of Oh In yu who was a founder of Haeju Oh clan. Oh In yu came over from China during Seongjong of Goryeo’s reign in Goryeo. O Jam passed Imperial examination during Wonjong of Goryeo’s reign. Then, O Jam successively served as a "munha sirang pyeongjangsa" (Korean: ; Hanja: ) and appointed as Prince of Hampung (Hanja: ). After that, O Jam began Hampyeong O clan.