A late header by Ryan Giggs gave United a deserved point in this thoroughly entertaining Champions League match.
The home crowd were ecstatic when Scott McDonald’s delightful lob from 14 yards gave Celtic a 13th-minute lead.
United pinned Celtic back for much of the first half, but stout defending limited the Red Devils to half chances.
Giggs headed an 84th-minute equaliser when Artur Boruc could only parry a Cristiano Ronaldo shot, then Dimitar Berbatov missed a great late chance.