The Carnew executions, the summary execution of 28 prisoners being held as suspected United Irishmen by the local garrison in the British army barracks base of Carnew Castle, Carnew, County Wicklow, takes place on May 25, 1798.
The Society of United Irishmen having failed to advance its aims of Catholic emancipation and parliamentary reform by political means, instigate a rebellion against British rule. The rebellion begins on the morning of May 24, 1798, but the only significant uprisings outside of the province of Ulster occur in counties Wicklow and Wexford, both south of County Dublin. The rebels are met with a swift response from British forces and the bulk of the rebellion is suppressed within a year.
By the morning of the May 25, news of the long-expected outbreak of the 1798 rebellion in neighbouring County Kildare and of military losses in the battles of Ballymore-Eustace, Naas, and Prosperous have reached the garrison in Carnew, who decide to take preventative measures by assembling the rebel suspects in detention. The suspects are marched from Carnew Castle to the local Gaelic handball alley and executed by firing squad as a warning to the local populace.
A similar mass execution of 36 nationalist prisoners occurs on the following day at Dunlavin Green.
News of the summary executions, together with news of the similar massacre at Dunlavin, spread throughout County Wicklow and across the border into County Wexford, giving substance to the rumours of widespread killing already prevalent. On June 7, the town is burned and sacked in a revenge raid by Wexford rebels, led by Anthony Perry.