Mícheál Mac Donncha (born Michael McConkey) is an Irish Sinn Féin politician who served as the Lord Mayor of Dublin from 2017 to 2018. He has been a Dublin City Councillor since 2014. He was co-opted onto Dublin City Council in 2011, to fill a vacancy caused by the resignation of Killian Forde. He was elected in 2014 for the Beaumont-Donaghmede local electoral area. He contested the 2016 general election as a Sinn Féin candidate in the Dublin Bay North constituency, one of two party candidates, his running mate Denise Mitchell being elected.