Brian Leddin is an Irish politician and former Green Party member who served as a Teachta Dála (TD) for the Limerick City constituency from 2020 to 2024. He was appointed Chair of the Joint Oireachtas Committee on Climate Action in September 2020, and was a member of the Joint Oireachtas Committee on Agriculture, Food and the Marine, and Chair of the Green Party's parliamentary party. He was the Green Party spokesperson for Transport, Energy and Climate Action. He left the Green party in 2025 due to the party's decision to support Catherine Connolly's presidential campaign.