Filed under: TMZ Sports, Joe Montana, Nathaniel Montana, Celebrity Justice

Joe Montana‘s son Nathaniel Joseph Montana — currently a quarterback at the University of Montana — was arrested on suspicion of DUI early this morning … in Missoula, Montana.


Law enforcement sources tell TMZ, 21-year-old Nathaniel was arrested shortly before 4 AM — and released soon after on $685 bond.

We’re told Nathaniel was originally stopped for speeding — with several other people in the vehicle — and after cops pulled him over, he flunked a field sobriety test.

Nathaniel — who transferred from Notre Dame in February to vie for the starting QB position at U. Montana — is due back in court this afternoon.