Mustafa Yumlu (born 25 September 1987) is a Turkish professional footballer who currently plays as a center back for Denizlispor in the Süper Lig.
Yumlu began his footballing career as an eleven-year-old in Aydinlispor's youth team. He was transferred to Trabzonspor the following year, where he played in their youth teams until 2003. He joined another local club, Idmanocağı, and competed with them for three years before joining Arsinspor in 2006. Yumlu was loaned out immediately to 1461 Trabzon, where he competed in 29 matches, scoring one goal. He returned to Arsinspor the following season, featuring in 34 matches while scoring four goals. Trabzonspor transferred him for the second time in 2008, but he was immediately loaned out to 1461 Trabzon for the second time as well. Yumlu spent two years on loan at 1461 Trabzon before joining up with the Trabzonspor senior squad at the start of 2010–11 season. He competed in six friendlies, scoring one goal.