The Oh Family are influential members of the Ekaterina Branch, with many of them ending up as the leaders of the branch. They are of Korean descent.
Branch leadership in the Ekaterinas is usually hereditary. Gordon Oh was the leader until Bae Oh ordered him to be assassinated. Because of the death of her husband, Lin Oh was heartbroken and died a few months later. Bae Oh was trialed in The Hague for the murder of his brother after Alistair Oh was able to get United Nations involved in it. Alistair Oh is famous for the invention of the Microwavable Burrito. Leadership of the branch supposedly went to Alistair, but because the Ekaterinas suspect him of sharing his Clues in the Madrigal stronghold, the question of who truly led the branch remained unanswered. After Trust No One, where Alistair Oh dies from untreated infections, the current branch leader remained unknown until in Doublecross, where Patricia Oh was made leader by Nathaniel Hartford. After she was arrested at the end of Doublecross it is unknown who leads the branch, though it is most likely not an Oh as there are no known members of the family that are currently able.