Premier League - Park signs United deal
The 30-year-old former South Korea captain, whose previous deal had one year left to run, has made 177 appearances for United, scoring 24 goals, and played in both Champions League final defeats to Barcelona in 2009 and last season.
"Ji has been an important player for us for a number of years now," Sir Alex Ferguson told the club website. "He has great ability and energy and in recent seasons has added the knack of scoring important goals in big games.
"He is a popular member of the squad and his experience at domestic and international level is invaluable for the younger players."
The first Asian player to feature in a major European final, he expressed his delight at signing a new deal at the Premier League champions.
"I have enjoyed every minute of my time at United," he said.
"I’m delighted to be part of the club during this latest stage in its history - with another exciting young team being built.
"I’m looking forward to playing my part in keeping United at the top of the game."