Urlacher has played all 13 seasons with the Bears and is considered one of the greatest linebackers in franchise history.
"We were unable to reach an agreement with Brian and both sides have decided to move forward," Bears general manager Phil Emery said in a statement. "Brian has been an elite player in our league for over a decade. He showed great leadership and helped develop a winning culture over his time with the Bears. We appreciate all he has given our team, on and off the field. Brian will always be welcome as a member of the Bears."