The 31-year-old -- who had become a peripheral figure under Jose Mourinho last season -- signed a two year contract for an undisclosed fee bringing the curtain down on 13 trophy-laden years at Old Trafford.
Rooney -- whose move comes the day after United announced they had agreed terms with Everton over buying their leading scorer Romelu Lukaku -- will hope the move also revives his international career which also stalled last season.
"It is some time since I said that the only Premier League club I would play for other than Manchester United was Everton, so I am delighted that the move has happened," he said in a statement to The Press Association.
"I have come back to Everton because I believe (Everton manager) Ronald Koeman is building a team that can win something and I look forward to playing my part in making that a reality for the club I have supported since a boy."
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Koeman said in Rooney -- who in his time at United won among other trophies five Premier League titles and a Champions League -- he was buying a player with a surefire winner's mentality.
"He loves Everton and he was desperate to come back. He is still only 31 and I don't have any doubts about his qualities. It's fantastic he's here.
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