Found following Turkish translation(s) for the English word/phrase "governing body".
1 (n) English: administration, governance, governing body, establishment, brass, organization, organisation: the persons (or committees or departments etc.) who make up a body for the purpose of administering something. 'he claims that the present administration is corrupt'. 'the governance of an association is responsible to its members'. 'he quickly became recognized as a member of the establishment'
Turkish: idare, yönetim, yönetişim, yönetim organı, idari makam, kuruluş, organizasyon, kurul: