John O'Connell JP DL (24 December 1810 – 24 June 1858) was one of seven children (the third of four sons) of the Irish Nationalist leader Daniel O'Connell and his wife Mary. He followed his father as a member of parliament and leader of the Repeal Association.
Educated at Clongowes Wood College, Trinity College, Dublin, and the King's Inns, O'Connell was then called to the bar, but did not practice.
He served in the United Kingdom Parliament as Member of Parliament for Youghal from 1832 to 1837, for Athlone from 1837–1841, for Kilkenny from 1841–1847, for Limerick from 1847–1851 and for Clonmel from 1853-57.
In 1843, O'Connell was tried with his father in the State Trials, and was imprisoned in Richmond prison before being released the next year by an order of the House of Lords. During his father's declining years, he was the dominant force in the Repeal Association and denounced Young Ireland as irreligious and lawless. In 1847, he closed down Conciliation Hall, and in 1848 reacted to the Rising by establishing closer links with the government. Of Daniel's four sons, he was considered to be the only one who inherited something of his father's political skill: he was nicknamed "The Young Liberator", although critics claimed he did little to justify the title.