Harris, a 35-year-old cornerback, hasn't played since the 10th game of the 2009 season due to a knee injury.
"We want to thank Al for his contributions to the Green Bay Packers," said Packers General Manager Ted Thompson. "His hard work, dedication and professionalism have been the keys to his success. During his time here, he has been a valuable member of our organization and our community. We wish him the very best in the future and he will always be a part of the Packer family."
Harris joined Green Bay in 2003 and started 102 games for the Packers. He earned Pro Bowl honors in 2007 and 2008. He played for the Philadelphia Eagles for five seasons before moving to the Packers.
He has 21 interceptions, two of which he returned for touchdowns, over 12 NFL seasons.