John O’Donnell (1866–1920) was an Irish journalist, Nationalist politician and Member of Parliament (MP) in the United Kingdom House of Commons from 1900 to 1910.
He first became active in politics as an organiser for the United Irish League (UIL) in County Mayo during 1898–89 as a protégé of William O'Brien .
O’Donnell bought the machinery of O’Briens closed down newspaper, the Irish People, moved to Galway and there set up the Connaught Champion.
In the January 1910 general elections O’Donnell was returned for O’Brien's newly founded All-for-Ireland League, this time through clerical support against an anti-clerical opponent.
However, in the subsequent December 1910 general elections he was forced to retire through lack of support, while an Irish Party boycott drove his newspaper out of business in 1911.