Dejan Udovičić (; born 27 July 1970) is a Serbian professional water polo head coach. He was named head coach for Serbia in June 2006, after the dissolution of the state union of Serbia and Montenegro. As a senior, he played for Partizan Belgrade and VK Beograd, while his coaching career started with Partizan where he stayed for nine seasons (2000-2009). His most notable achievement with the club was third place at the 2007 Euroleague Final Four in Milan. As the head coach of the Serbian national team, he has won gold medals at the 2009 World Aquatics Championships and the 2006 Men's European Water Polo Championship, as well as the 2012 Men's European Water Polo Championship. He has also steered the national team to a bronze medal at the 2008 Olympics in Beijing.