Diego Fernando Pérez Aguado (Spanish pronunciation: ['dje?o 'pe?es]; born 18 May 1980), nicknamed "Ruso" (Spanish for "Russian"), is a retired Uruguayan footballer who last played as a defensive midfielder for Italian Serie A club Bologna.
He has played 89 matches for the Uruguay national football team, including the 2010 FIFA World Cup and the 2001, 2004, 2007 and 2011 editions of the Copa América.