Mert Müldür (born 3 April 1999) is a professional footballer who plays as a right-back or a centre-back for Süper Lig club Fenerbahçe.

Müldür joined the SK Rapid Wien youth academy at the age of six in 2006, and worked his way up into the professional team.

[2] He made his professional debut for SK Rapid in a 4–1 Austrian Football Bundesliga loss to FC Red Bull Salzburg on 13 May 2018.

[6] He made his debut with the team in a 3–0 UEFA Europa Conference League win over NK Maribor on 17 August 2023.

[9] He made his debut for the senior Turkish national team on 11 October 2018 in a 0–0 friendly draw against Bosnia and Herzegovina.