MacIntyre was yelling at the officials as he chased them off the field following the loss. Security officials turned him away.
Pac-12 Commissioner Larry Scott called MacIntyre's actions ''completely unacceptable.'' The fine will go toward the Pac-12 student-athlete scholarship fund.
The Buffaloes lost to the Beavers 36-31. Afterward, Macintyre would not comment on the officiating.