The 1966 Oregon State Beavers football team represented Oregon State University during the 1966 NCAA University Division football season. Four home games were played on campus in Corvallis at Parker Stadium and two at Multnomah Stadium in Portland.
Under second-year head coach Dee Andros, the Beavers were 7–3 overall and 3–1 in the Athletic Association of Western Universities (AAWU, later Pacific-8 Conference, or Pac-8). Only one of the four conference teams from the state of California was on the schedule; champion USC shut out OSU in Portland.
Following a 1–3 start, OSU won its last six games, and were ranked nineteenth in the final UPI Coaches Poll.
The starting quarterbacks this season were senior Paul Brothers and sophomore Steve Preece. Workhorse senior fullback Pete Pifer became the school's all-time leading rusher, overtaking Sam Baker.
|• Oregon St
|1||OSU||Mike Haggard 29-yard field goal||OSU 3-0|
|2||OSU||Paul Brothers 17-yard run (Mike Haggard kick)||OSU 10-0|
|2||OSU||Mike Haggard 34-yard field goal||OSU 13-0|
|4||ORE||Scott Cress 25-yard pass from Mike Brundage (Mike Brundage kick)||OSU 13-7|
|4||OSU||Pete Pifer 14-yard run (Mike Haggard kick)||OSU 20-7|
|4||0:00||ORE||Jim Smith 96-yard fumble return (Mike Brundage to Lynn Hendrickson pass)||OSU 20-15|
On a very muddy field at Parker Stadium, Beaver fullback Pete Pifer became the first in AAWU history to run for more than 1,000 yards in two consecutive seasons with 130 yards on 31 carries. Pifer and his backfield teammates, Paul Brothers and Bob Grim, combined for 284 total yards of the Beavers' offense.