William Augustine O'Carroll (1831–1885) was an Irish nationalist, radical liberal, journalist and Queensland newspaper editor.
O'Carroll was the son of a ship's captain and born in a family bakery In Patrick Street, Cork, Ireland.
He left Ireland, allegedly with 'a prize on his head' following the failure of the 'St Patrick Plot' and he subsequently migrated to Brisbane with his family by the Chatsworth in 1862.
Yet although Lukin retained the position as editor, and to some extent discharged the duty of that office, O'Carroll was from the beginning entrusted with a large share of the editorial responsibility.
It was stated at his death that O'Carroll had been the 'de facto editor' of the Brisbane Courier onwards from the mid-1870s and remained in that position right through to September 1883, when the new managing proprietor Charles Hardie Buzacott appointed Carl Adolf Feilberg as editor-in-chief of the Brisbane Courier and its weekly the Queenslander.