John O'Connor KC (10 October 1850 – 27 October 1928) was an Irish Nationalist revolutionary-turned Irish Parliamentary Party parliamentarian MP in the House of Commons of the United Kingdom of Great Britain and Ireland and as member of the Irish Parliamentary Party represented Tipperary in 1885, and South Tipperary from 1885 to 1892, and North Kildare from 1905 to 1918. He was also member of the English Bar.