Joe O'Reilly is an Irish Fine Gael politician has served as a Senator for the Labour Panel since April 2016, and previously from 2007 to 2011 for the Industrial and Commercial Panel and from 1989 to 1992 for the Cultural and Educational Panel. He served as Leas-Chathaoirleach of Seanad Éireann from August 2020 to December 2022. He served as a Teachta Dála (TD) for the Cavan–Monaghan constituency from 2011 to 2016.

Cathaoirleach is the title of the chair of Seanad Éireann, the sixty-member upper house of the Oireachtas, the legislature of Ireland. The current Cathaoirleach is Fine Gael Senator Jerry Buttimer, who has held the office since 16 December 2022.