Sergiu Marian Radu (born 10 August 1977) is a former Romanian professional footballer who played as forward in Romania, France, and Germany at top tier level (i.e. Liga I, Ligue 1, and Bundesliga respectively).

[1][4] He was transferred by coach Mircea Lucescu at Rapid București where in his first season he scored two goals in 15 appearances which helped the club win the 1998–99 Divizia A title and helped the club reach the Cupa României final in which he was not used by Lucescu as the team lost with 3–2 in front of Steaua București, also assistant coach Nicolae Manea gave him the nickname "Schijă" (The Shrapnel) after he described Radu's style of play as "quick and penetrating like a shrapnel bouncing off a bomb".

[1][5][6][7][9] In the middle of the 2000–01 season he went to play for Național București, the highlights of this period being a runner-up position with Cosmin Olăroiu coach in the 2001–02 season and in the following one when the team was coached by Walter Zenga he scored 12 goals in the league, played from halftime when he replaced Stelian Carabaș in the 1–0 loss in front of Dinamo from the Cupa României final and appeared in all six matches from the UEFA Cup campaign as the team eliminated Tirana against whom he scored two goals, Heerenveen, being defeated with 3–0 on aggregate by Ronaldinho's Paris Saint-Germain.

[1][24][26] In 2007, during his prolific season spent at Energie Cottbus together with Vlad Munteanu, the Romanian press insisted that they should be called-up for the national team but coach Victor Pițurcă did not accept saying about the Bundesliga championship:"It's not what it once was!

"[13][17][19][20][27] However later that year, in September after he was transferred at VfL Wolfsburg, Radu was called-up by Pițurcă to play for Romania as a starter until he was replaced in the 57th minute with Florentin Petre in a 3–1 away victory against Belarus at the Euro 2008 qualifiers.