Kate Lieber is an American politician, who served as Majority Leader of the Oregon State Senate from 2023 to 2024.

She represents Oregon's 14th Senate district, which includes the cities of Beaverton, Aloha, and portions of Washington and Multnomah counties.

She was nominated by Governor Ted Kulongoski to the Psychiatric Security Review Board (PSRB) on which she served for eight years (and chaired for five).

[3] On November 18, 2022, Lieber was elected Majority Leader by the Oregon Senate democratic caucus.

[4] In June 2024, she announced she would step down from the role on July 15 to become co-chair of the joint ways and means committee, a position being vacated by Senator Elizabeth Steiner.