Domagoj Duvnjak is a Croatian professional handball player for THW Kiel. Duvnjak is regarded as one of the best handball players of all time alongside fellow Croatian Ivano Balić. On 26 January 2014, he was named the IHF World Player 2013.
He became a member of the Croatia national team in 2006. He represented Croatia at the multiple Olympics: 2008, 2012, 2016 and 2024.