The Irish Rebellion of 1798 (Éirí Amach 1798), also known as the United Irishmen Rebellion (Éirí Amach na nÉireannach Aontaithe), was an uprising against British rule in Ireland lasting from May to September 1798. The United Irishmen, a republican revolutionary group influenced by the ideas of the American and French revolutions, were the main organising force behind the rebellion.

The rebellion conclusively failed and resulted in the execution of 34 of its key leaders and supporters and ultimately led to the Act of Union of 1800, in which Ireland was fully brought under the governmental control of England.