Here’s a list of some famous fans(if you don’t know who some of them are I don’t blame you most of them are English).

http://aveit1.netfirms.com/manchester_united%20famous%20fans.htm

Also, in a statement this week after breaking a world record, and one of his own records, Usain Bolt said that he was a Manchester United fan. Thank you Insane Bolt, with your support I’m sure we will break world records this season.