The second Battle of Arklow took place during the Irish Rebellion of 1798 on 9 June when a force of United Irishmen from Wexford, estimated at 10,000 strong, launched an assault into County Wicklow, on the British-held town of Arklow, in an attempt to spread the rebellion into Wicklow and to threaten the capital of Dublin.

The Irish Rebellion of 1798 (Irish: Éirí Amach 1798; Ulster-Scots: The Hurries) was a major uprising against British rule in Ireland. The main organising force was the Society of United Irishmen, a republican revolutionary group influenced by the ideas of the American and French revolutions: originally formed by Presbyterian radicals angry at being shut out of power by the Anglican establishment, they were joined by many from the majority Catholic population.

Following some initial successes, particularly in County Wexford, the uprising was suppressed by government militia and yeomanry forces, reinforced by units of the British Army, with a civilian and combatant death toll estimated between 10,000 and 50,000. A French expeditionary force landed in County Mayo in August in support of the rebels: despite victory at Castlebar, they were also eventually defeated. The aftermath of the Rebellion led to the passing of the Acts of Union 1800, merging the Parliament of Ireland into the Parliament of the United Kingdom.

Despite its rapid suppression the 1798 Rebellion remains a significant event in Irish history. Centenary celebrations in 1898

were instrumental in the development of modern Irish nationalism, while several of the Rebellion's key figures, such as Wolfe Tone, became important reference points for later republicanism. Debates over the significance of 1798, the motivation and ideology of its participants, and acts committed during the Rebellion continue to the present day.