- The Annals of Ulster. Translated from the text of O'Conor's Rerum Hibernicarum scriptores veteres for the Ulster Journal of Archæology.
- Columbanus Ad Hibernos: Or, a Letter From Columban to His Friend in Ireland, On the Present Mode of Appointing Catholic Bishops in His Native Country, Issues 1-5
- Opinion of Charles O'Conor, Esq'r, on the Treasury Agent System of Cotton Seizures in the South, Also Concurring Opinion of Wm. M. Evarts, Edwards Pierrepont, and James T. Brady, Esq'rs
- The case of the Roman-Catholics of Ireland. Wherein the principles and conduct of that party are fully explained and vindicated.
- Seasonable thoughts relating to our civil and ecclesiastical constitution.

















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