Çetin progressed through the youth ranks of the National Team, from Under-17 to the full senior squad. He made his debut for Turkey in a 0–4 friendly match loss against Czech Republic on 30 April 2003, coming on for Alpay Özalan in the 83rd minute. He made two appearances at the FIFA Confederations Cup in 2003. He captained the international side for the first time during Turkey's 2–1 win against Bosnia and Herzegovina in October 2008.