Osman Ertuğrul Çetin (born 21 April 2003) is a Turkish association footballer who plays as a goalkeeper for Turkish club Gençlerbirliği, on loan from Fenerbahçe. Çetin started his career at Fenerbahçe, in 2014. In October 2020, Çetin moved to Altınordu. In January 2021, Çetin moved back to Fenerbahçe.He made his professional debut with Fenerbahçe in a 1–1 Süper Lig draw against Antalyaspor on 15 January 2022, at the age of 18.