Haeju Oh clan (Korean: 해주 오씨; Hanja: 海州 吳氏) is a Korean clan.

Their Bon-gwan is in Haeju, Hwanghae Province.

As of 2000[update], the clan has a membership of 422,735.

Their founder was Oh In yu [ja], who was the governor of Haeju county during the era of Goryeo.

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