Mel Gibson -- Master of Disguise!

9/14/2010 8:00 PM PDT BY TMZ STAFF
The similarities are striking ... but no, the man you're looking at is not Wilford Brimley ... it's Mel Gibson ... in disguise!!!!

Mel taped on his best Quaker Oats moustache -- along with a hat and glasses combo -- in a failed attempt to go incognito in L.A. yesterday.

Can't imagine why he'd wanna hide his identity ...