Di Natale's previous deal would have expired next year but his new deal will take the Italy striker through until the end of the 2013/14 season.
A statement from Udinese read: "Udinese Calcio announces, with satisfaction, that it has extended the agreement with captain Antonio Di Natale for a further season.
"The contract will expire on June 30, 2014."
The 34-year old forward was pivotal in helping Udinese clinch third spot in Serie A last season, finishing as the top Italian scorer in the league with 23 goals.
Di Natale was a member of the Italy Euro 2012 squad that finished as runners-up, and was notable for scoring the only goal conceded by eventual champions Spain in the whole tournament, in a 1-1 draw between the sides in the group stage.
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