Nurettin Sözen (born 1937 in Gürün) is a Turkish doctor, politician and the former mayor of Istanbul, Turkey.
He graduated from Istanbul University and then became a professor in 1978.
He was elected as the mayor of Istanbul on March 28, 1989 while he was a member of SHP.
He didn't take any active political missions until he was elected as the deputy of Sivas, his homeland, in 2002.
Sözen is a member of Republican People's Party.