Catherine Malloy Hollern (born 12 April 1955) is a British Labour Party politician serving as Member of Parliament (MP) for Blackburn since 2015.
Hollern served as Shadow Minister for the Armed Forces from January 2016 to October 2016, following the reshuffle of the Shadow Cabinet, and resignation of Kevan Jones.
She has served as Shadow Minister for Communities and Local Government since October 2016.
In July 2017, Hollern was made Parliamentary Private Secretary to Jeremy Corbyn, Leader of the Opposition.