Mikko Johannes Halvari (born March 4, 1983 in Porvoo) is a Finnish decathlete. He won a bronze medal for his category at the 2002 IAAF World Junior Championships in Kingston, Jamaica, with a solid score of 7,587 points. He is also a full-time member of Tuusulanjärven Urheilijat, a local track and field club in Tuusula, and is coached and trained by Jussi Välimäki.At age twenty-five, Halvari made his official debut for the 2008 Summer Olympics in Beijing, where he competed in men's decathlon.