Former college football star Ryan Mallett was arrested for driving while intoxicated on Tuesday ... after the ex-NFL quarterback crashed his car in Arkanas ... TMZ Sports has confirmed.

Officials say 31-year-old Mallett was involved in a 2-car collision in Springdale around 6:30 PM. We're told his car crossed over the center line while driving.

Cops tested his blood alcohol level ... and he blew a .08, jail officials tell us.

Along with the DWI, Mallett was also cited for careless prohibited driving for swaying over the center line.