An Allegheny County judge on Monday acquitted Baldwin of indecent assault, harassment and disorderly conduct.
A campus police officer testified during Baldwin's nonjury trial that the player admitted smacking the student's buttocks on the shuttle bus. Campus police say the woman complained of the alleged assault April 18 and charges were filed the next day.
Judge Kevin Sasinoski, however, says there is no evidence of indecent assault.
Baldwin was disciplined by the school, a Pitt spokesman said.
The 20-year-old Baldwin had 1,111 receiving yards and eight touchdowns for the Panthers last season.