Olu Ashaolu came off the bench to score 22 points, grab six rebounds and hand off four assists, while Carlos Emory added 19 points and seven boards for the Ducks (24-9), who shot a sizzling 59.3 percent from the field.
Devoe Joseph and Garrett Sim provided 15 points each as third-ranked Oregon moved on to the NIT quarterfinals, where the Ducks will face top-seeded Washington.
Roy Devyn Marble drained seven 3-pointers, finishing with 31 points for the seventh-seeded Hawkeyes (18-17).
Aaron White had 22 points and eight rebounds for Iowa.
Notable deaths of 2014 [PHOTOS]