The 2004 Big Ten Conference football season was the 109th season for the Big Ten Conference. Michigan and Iowa were conference co-champions, with 7-1 conference records.
After the 2004 season, the conference had four players drafted in the first round of the 2005 NFL draft: Braylon Edwards (#3, Michigan), Erasmus James (#15, Wisconsin), Luis Castillo (#27, Northwestern), Marlin Jackson (#28, Michigan). Ohio State kicker Mike Nugent was selected in the second round with the 47th overall pick, the highest that a Big Ten Conference kicker had ever been drafted.