Catherine Ardagh (born 20 September 1982) is an Irish Fianna Fáil politician who has served as Leader of the Opposition in the Seanad and Leader of Fianna Fáil in the Seanad since May 2016.
She has served as a Senator for the Industrial and Commercial Panel since April 2016.She was a member of Dublin City Council from 2009 to 2016.
Catherine is the daughter of former TD Seán Ardagh.
She was an unsuccessful candidate for the Dublin South-Central constituency at the 2016 general election.
She is the Fianna Fáil Seanad spokesperson on Social Protection.