The idea of 21st ISTANBUL International Conference on “Organic Agriculture, Biodiversity and Public Health” (OABPH-21) scheduled on June 7-9, 2021 at Istanbul (Turkey) is for the researchers, scientists, scholars, engineers and practitioners from all around the world to present and share ongoing research activities. This conference provides opportunities for the delegates to exchange new ideas and application experiences face to face, to establish business or research relations and to find global partners for future collaboration.