Catherine Malloy Hollern (born 12 April 1955) is a British Labour Party politician serving as Member of Parliament (MP) for Blackburn since 2015. A member of the opposition front bench under the leadership of both Jeremy Corbyn and Keir Starmer, she previously served as the Parliamentary Private Secretary (PPS) to the former from 2017 to 2020, a Shadow Minister for Local Government from 2020 until her resignation in 2021, and briefly a shadow defence minister in 2016. Prior to her election to Parliament, she served as the leader of Blackburn with Darwen Borough Council.