Donnellan is an Irish surname and refers to the clan name Ó Domhnalláin.
At least two unrealated families of the name existed in Gaelic Ireland. One in south-east Ulster, another in south-east Connacht in the kingdom of Ui Maine.
The patron of the Donnellan's of Ui Maine is Saint Grellan. The family derive their name from Domnallan mac Maelbrigdi.
Donnellan may refer to:
- Domnallan mac Maelbrigdi of Ui Maine, ancestor of the Donnellans of Galway, fl. c. 9th/10th century
- Ainglioch Ó Dónalláin, poet, fl. mid-14th or mid-15th century
- Flann Óge Ó Domhnalláin, Chief Poet of Connacht, died 1342
- Mael Sechlainn Ó Domhnalláin, Irish poet, died 1375
- Flann Óc mac Séoan Ó Domhnalláin, Ollamh Síol Muireadaigh, 1404
- Nehemiah Donnellan, Archbishop of Tuam, fl. c. 1560-1609
- James Donnellan, lawyer and politician, c. 1588 - 1665.
- Pádhraic Ó Domhnalláin, Irish duelist, fl. 1830.
- Padraig Ó Domhnallain, short-story writer, born 1884.
- Seosamh Ó Dónalláin, Irish Republican Army, died 1920.
- Michael Donnellan, Clann na Talmhan politician, 1900-1964.
- Martin Donnellan, recipient of the Scott Medal, born 1948.
- Declan Donnellan, theatre director
- John Donnellan, Irish politician
- Keith Donnellan, philosopher
- Michael Donnellan, various including
- Michael Donnellan, Irish Clann na Talmhan politician
- Michael Donnellan, GAA footballer
- Nanci Donnellan, sports radio broadcaster
- Philip Donnellan, English documentary film-maker
- Thomas Donnellan, Roman Catholic Archbishop of Atlanta, 1968-1987
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