Charles Underwood O'Connell (1 August 1838 [on gravestone] - 22 February 1902) was a Fenian activist from County Cork, Ireland.

[1][2][3][4][5] Details of plans for a Fenian uprising in Ireland were inadvertently discovered and handed in to Dublin Castle, the location of British administration and headquarters of the police.

Later, a document found in Stephens's newspaper, The Irish People, led to the arrest of leading Fenians and the suppression of the paper.

On 20 September 1865, O'Connell was arrested on a vessel at Queenstown which was on its way to Great Britain (the U.S. Department of State (15 January 1867) named the steamer City of New York; The Morning Post (25 September 1865) said he was arrested on a tender conveying passengers to Queenstown from the National Company's vessel, Louisiana).

In the Special Commission in Cork on 28 December, the Dublin police informant, Pierce Nagel, who worked at The Irish People and found the documents which led to the Fenian arrests, said he'd seen O'Connell in Mahony's office in New York.