Andy Griffith -- Already Buried

Andy Griffith only passed away a few hours ago -- but TMZ has learned, the Hollywood icon has already been buried.

A rep for Twiford Funeral Homes in Manteo, North Carolina tells us, Andy was buried at 11:30 AM on his family farm on Roanoke Island. We're told Andy had previously requested to be buried immediately after his death ... so that's why it all happened so fast.

We made calls to find out if Andy was embalmed. No one was talking, but we're told it's legal in North Carolina to bury people without embalming them.

We're told Andy's burial followed a small, private service with close friends and family in attendance.