O'Kelly was born on 4 July 1846 in Baltinglass, County Wicklow, Ireland. He grew up attending school at Mountrath Monastery and St Patrick's College, in Carlow, Ireland.
Career
O'Kelly was elevated to Chairman of the Baltinglass Board of Guardians in 1893 and was appointed a magistrate in 1894. He was a passionate Land Leaguer.
In April 1895, O'Kelly was elected as a Member of Parliament as an Anti-Parnellite Irish National Federation candidate at the by-election for the West Wicklow constituency, following the resignation of John Sweetman MP.[2] However, Parliament was dissolved on 8 July for the 1895 general election, and O'Kelly decided not to defend his seat.[2] Instead, O'Kelly focused on local politics, becoming the first chairman of the newly established Wicklow County Council in 1899.
O'Kelly married Judith Whelan (1862–1911), the daughter of Myles Whelan of Athy, County Kildare, in 1882, by whom he had issue: Eileen (Sister Marie de Chantal), Anne Edith (Sister Mary Magdalen), Edward John, Teresa Mary (Sister Mary Marguerite), Joseph, Mrs Agnes Lynch; Father Patrick O'Kelly SJ, Muriel Carmella, Prof. William D. O'Kelly, Genevieve, and Mrs Ethel O'Loughlin.
O'Kelly was a close friend of Douglas Hyde, first President of Ireland, and John Redmond, a leader of the Irish Parliamentary Party.