Seyoum Mengesha KBE was an army commander and a member of the royal family of the Ethiopian Empire.

Until the end of the Ethiopian monarchy in 1974, there were two categories of nobility in Ethiopia and Eritrea. The Mesafint, the hereditary royal nobility, formed the upper echelon of the ruling class. The Mekwanint were the appointed nobles, often of humble birth, who formed the bulk of the aristocracy. Until the 20th century, the most powerful people at court were generally members of the Mekwanint appointed by the monarch, while regionally, the Mesafint enjoyed greater influence and power. Emperor Haile Selassie greatly curtailed the power of the Mesafint to the benefit of the Mekwanint, who by then were essentially coterminous with the Ethiopian government.