Ogboni (also known as Osugbo in Ijèbú) is a fraternal institution indigenous to the Yoruba language-speaking polities of Nigeria, Republic of Bénin and Togo. A similar group in Igbo-speaking areas is called Nze na Ozo. The society performs a range of political and religious functions, including exercising a profound influence on regents and serving as high courts of jurisprudence in capital offenses. Its members are generally considered to be part of the nobility of the various Yoruba kingdoms of West Africa.
Though versions or lodges of this fraternal group are found among the various types of Yoruba polities – from highly centralized kingdoms and empires like Oyo, to the independent towns and villages of the Ègbá and the Èkiti – the Ogboni are recognizable for their veneration of the personified earth (Ilè or Oduduwa) and their emphasis on both gerontocratic authority and benevolent service to the community. While membership in the Ogboni generally signified a high level of power and prestige, the society held pre-eminent political authority among decentralized groups like the Ègbá, where they were intimately involved in the selection of rulers that served as little other than figureheads in practice. In contemporary Yorubaland, Ogboni members still command great power and influence in the affairs of their societies, although this is largely due to the history of their respective chieftaincies and not to any official authority.