Mary Callaghan is an Irish Social Democrats politician who has represented Ballymun-Finglas on Dublin City Council since 2019. She served as Deputy Lord Mayor of Dublin to then Lord Mayor Hazel Chu from 2020 to 2021. She was elected Deputy Mayor with a 43 to 9 margin, marking the third time in history that the top two positions in Dublin have both been held by women. References External links Social Democrats profile Living people Alumni of University College Dublin Local councillors in Dublin (city) People from Finglas Social Democrats (Ireland) politicians Year of birth missing (living people)