Radu Stefan Mazare (born July 5, 1968) is a Romanian politician.
His political activity began with his election to the lower house of the Parliament on the Democratic Party list, which he left in 1997 to serve as an independent.
In 2000 he defeated all party-supported contestants to be elected mayor of Constan?a, one of Romania's largest cities and its foremost seaport.
Joining the Social Democratic Party in 2003, he went on to win the following three elections with a comfortable majority.
In 2015, during his fourth term, Mazare resigned amid accusations of corruption, citing the unbearable stress caused by what he claimed to be politically motivated investigations.
In 2017 he fled while under bail to Madagascar, claiming the right of asylum, but he was extradited back to Romania on 20 May 2019 to serve a 9-year sentence in prison.