Ștefan Radu, Romanian footballer
Ștefan Daniel Radu (Romanian pronunciation: [ʃteˈfan daniˈel ˈradu]; born 22 October 1986) is a Romanian professional footballer who plays as a left-back or a centre-back for Serie A club Lazio.

After a stint in his home country with Dinamo București during which he earned three domestic honours, including one national title, Radu moved to Lazio in 2008 on an initial loan. He has since spent his career with the Biancocelesti, gaining team captaincy and winning the Coppa Italia and the Supercoppa Italiana on three occasions each. In 2021, Radu became the leading appearance maker for Lazio in all competitions.

He registered his senior debut for the Romania national team in 2006, and made thirteen appearances before his early retirement in 2013, at age 26.