Marcel Van Minh Phuc Long Nguyen (born 8 September 1987) is a German gymnast. In 2012, he became an Olympic silver medalist after competing at the 2012 London Olympic Games. He's a soldier (currently ranked Corporal) in the Bundeswehr (German military) since July 2007, beginning when he was training in the Bundeswehr Sports Development Group (Sportfördergruppe der Bundeswehr) in Munich.
Born in Munich, to a German mother and a Central Vietnamese father, Nguyen began gymnastics at the age of four, and at seven years of age, joined TSV Unterhaching. Since 1995, he has trained at the regional training center in Munich. Since 1997, Nguyen was part of the squad perspective, where Andreas Hirsch and Jens Milbradt were his coaches. He rose quickly from the D- to B-squad. Since 2002, he has started for the Junior National Team. In 2005, Nguyen was the German junior champion on parallel bars, runner-up on rings and third in the vault. That same year he took part in the World Championships in Melbourne for the first time and placed 16th on the parallel bars. After the World Cup, Nguyen spent a year at the sports boarding school in Stuttgart in order to prepare with his teammates under the coaches Anatoli Jarmovski and Klaus Nigl for the 2006 World Championships in Aarhus.