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
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