The Manchester United legend and club ambassador was one of 14 torchbearers on the torch relay's local leg, which started at nearby MediaCityUK. Sir Bobby carried the flame in front of the stadium, one of the host venues for the London 2012 football tournament, and posed for photos on the forecourt before passing on the flame to the next torchbearer.
"It's staggering to see so many people out at this time in the morning," said Sir Bobby, referring to the 6am crowd at Old Trafford.
"But the people like to be part of it and I'm so proud. [Hosting the Olympics is] something that we worked for and we were so pleased when it happened [the bid was successful]. It's just been terrific."
The Olympic flame arrived in Britain from Greece on 18 May and the relay began at Land's End, Cornwall, the next day. Sir Bobby is one of 8,000 torchbearers who will have transported the flame to 1,000 cities, towns and villages across the UK by the time it completes its 8,000-mile, 70-day journey to London 2012's opening ceremony on 27 July.
There are still hospitality packages available for the Olympic football matches at Old Trafford. Find out more at manutd.com/olympichospitality.