Mehmet Zeki Sezer is a Turkish politician and former chairman of the Democratic Left Party (Demokratik Sol Parti, DSP), he was elected in the 6th ordinary party congress in 2004 after the resignation of Bülent Ecevit.Sezer was born in 1957 in Eskişehir. He graduated from M. Rüştü Uzel Chemistry Vocational High School and then from the School of Chemical Engineering at Gazi Üniversitesi in Ankara.