Ronaldo's magnificent strike against Porto in last season's European Cup quarter-finals was voted the best United goal from the past ten years.
Wayne Rooney finished in runners-up spot for his splendid volley against Newcastle in 2005.
Wonderful strike: Ronaldo fires home against Porto
Paul Scholes claims third and fourth place in the list, for his stunning strike at Villa Park in 2006, and his unforgettable European Cup winner against Barcelona at Old Trafford in 2008.
Ronaldo is in fifth spot in the poll, as voted for by readers of United's official magazine and website, with his wonderful free-kick against Portsmouth two years ago.
The Portuguese star left United for Real Madrid last summer after six memorable seasons in the north-west.
Ronaldo helped United to three successive Premier League titles, and a famous European Cup triumph in Moscow.
Stunning: Wayne Rooney volleys his marvellous goal against Newcastle in 2005
Manchester United Goals of the Decade 2000-20091) Cristiano Ronaldo v Porto, 2009 (20%)2) Wayne Rooney v Newcastle, 2005 (15%)3) Paul Scholes v Aston Villa, 2006 (11%) 4) Paul Scholes v Barcelona, 2008 (10%)5) Cristiano Ronaldo v Portsmouth, 2008 (6%)6) Federico Macheda v Aston Villa, 2009 (6%)7) Cristiano Ronaldo v Arsenal, 2009 (5%)8) Paul Scholes v Bradford, 2000 (4%) 9) Ruud van Nistelrooy v Charlton, 2005 (4%)10) Paul Scholes v Panathinaikos, 2000 (4%)
Cristiano Ronaldo wins Puskas Goal of the Year award for his rocket for Manchester United against PortoPATRICK COLLINS: Is it time for Ferguson to ride into the sunset?MANCHESTER UNITED FC