• Turkish Surgical Association
• The Transplantation Society (TTS)
• The Middle East Society for Organ Transplantation (MESOT)
• The Turkic World Transplantation Society
• International College of Surgeons (ICS)
• Turkish Society of Colon and Rectal Surgery

Dr. Ümit Özçelik is an active member of both national and international medical societies, reflecting his strong engagement with the global surgical and transplantation community. His memberships allow him to contribute to ongoing research, attend international congresses, and collaborate with leading experts to promote advancements in organ transplantation and general surgery.