Tuna was born in Çanakkale on 2 July 1985. His maternal is of Turkish origin who immigrated from Thessaloniki, Greece. His mother is retired from the land office, his father is a teacher of mathematics.

He completed his undergraduate education at Dokuz Eylül University Faculty of Economics. He also studied Turkish classical music at Ege University Conservatory. Onur Tuna who knows how to play the guitar also has two songs called Acın Verdi and Tıpkı Sen. Onur Tuna has played licensed volleyball and basketball since the middle school years. He started to take part in theater plays in middle school and high school years. While studying at University in İzmir, he worked as a professional model for 4 years. He studied acting at Izmir Müjdat Gezen Art Center. When Onur Tuna settled down in Istanbul, he took private lessons for acting. Those acting pieces of training were containing method and front-camera acting skills. For this purpose, he worked with Ümit Çırak, Ayla Algan, Craft Theatre and Saim Güveloğlu.