| Honorific-Prefix: | Senator |
| Catherine Ardagh | |
| Office: | Leader of Fianna Fáil in the Seanad |
| Leader: | Micheál Martin |
| Term Start: | 18 May 2016 |
| Term End: | 29 June 2020 |
| Predecessor: | Darragh O'Brien |
| Successor: | Lisa Chambers |
| Office1: | Senator |
| Term Start1: | 8 June 2016 |
| Constituency1: | Industrial and Commercial Panel |
| Birth Date: | 20 September 1982 |
| Birth Place: | Crumlin, Dublin, Ireland |
| Nationality: | Irish |
| Party: | Fianna Fáil |
| Spouse: | Darragh McShea |
| Children: | 2 |
| Father: | Seán Ardagh |
Catherine Ardagh (born 20 September 1982) is an Irish Fianna Fáil politician who has served as a Senator for the Industrial and Commercial Panel since April 2016. She previously served as Leader of Fianna Fáil in the Seanad from 2016 to 2020.[1]
She was a member of Dublin City Council from 2014 to 2016.[2] [3] Catherine is the daughter of former TD Seán Ardagh.[4] She was an unsuccessful candidate for the Dublin South-Central constituency at the 2016 and 2020 general elections.[2] [5] She is the Fianna Fáil Seanad Spokesperson on Social Protection. She was re-elected as a Senator at the 2020 Seanad election.