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Pittsburgh Steelers legend Hines Ward had ONE concern during his DUI arrest last summer ... the media finding out about it -- this according to police dash cam footage obtained by TMZ.

During the tape, Ward asks one of the arresting officers, "This going to be all on the newspaper though?" The officer replies, "Only if you tell somebody."

DUI is no laughing matter -- but there is one funny moment, when Hines was sitting in the back of the squad car and the officer slammed on the brakes ... sending Ward's forehead into the plastic divider.

TMZ broke the story -- Ward was arrested in DeKalb County, Georgia last July after a police officer observed the football star failing to maintain lane in his Aston Martin ... and hitting a curb.