The rise of globalization has increased the need for globally prepared leaders in all sectors, including education. Despite clear calls within the literature for empirical research to support the development of globally prepared education leaders, little research has occurred and no prior peer-reviewed study regarding essential global leadership competencies in education was located. Due to this absence, a Delphi study, conducted in English, French, and Spanish, was conducted with an expert panel of official UNESCO delegates, national delegates of the UNESCO Associated Schools Project Network, and senior-level UNESCO Education Sector executives to identify essential leadership competencies for global education leaders. After completing three successive survey rounds, the panel reached consensus on 70 essential competencies required for future global education leaders including an ordinal ranking of essentiality of global education leadership competencies. The findings of the expert panel conclude that when preparing leaders in global education, general leadership competencies still apply and that global leadership competencies overall were valued more highly than domestic leadership competencies or even managerial-focused education competencies. Additional analysis revealed alignment with broad twenty-first century skills and a balance between personality-based and situational leadership competencies.