The Argentina international has penned a four-year contract with the Ligue 1 champions, just 12 months after arriving at Old Trafford from Real Madrid.
United paid Los Blancos a British-record £59.7 million for Di Maria but despite making a flying start to his Old Trafford career, the winger fell out of favour with manager Louis van Gaal over the course of the 2014-15 campaign.
After being given an extended summer break following his exertions at this summer's Copa America in Chile, Di Maria ultimately failed to join up with United on their pre-season tour of the United States.
Di Maria subsequently travelled to Qatar to undergo a medical with PSG and promptly expressed his excitement over his €60m move to the Parc des Princes.
"I am very happy to join Paris Saint-Germain," he told beIN Sports on Tuesday. "What I know about PSG is that they are a team who have won all possible titles in France last season. They're very important.
"I know too that they want to overcome the obstacle of the quarter-finals in the Champions League.
"I will do my best to help the team. We'll try to go as far as possible in the Champions League."
