Fernández represents the senior Spain national team internationally. He has won two FIBA World Cup titles, in 2006 and 2019, two Olympic silver medals in 2008 and 2012, as well as a bronze medal at the 2016 Summer Olympics. He also won three EuroBasket titles in 2009, 2011, and 2015, a silver medal in 2007, and a bronze medal in 2013. Fernández earned an All-EuroBasket Team selection in 2009.