The French expedition to Ireland, known in French as the Expédition d'Irlande, was an unsuccessful attempt by the French Republic to assist the outlawed Society of United Irishmen, a popular rebel Irish republican group, in their planned rebellion against British rule during the French Revolutionary Wars. The French intended to land a large expeditionary force in Ireland during the winter of 1796–1797 which would join with the United Irishmen and drive the British out of Ireland. The French anticipated that this would be a major blow to British morale, prestige and military effectiveness, and was also intended to possibly be the first stage of an eventual invasion of Great Britain itself. To this end, the Directory gathered a force of approximately 15,000 soldiers at Brest under General Lazare Hoche during late 1796, in readiness for a major landing at Bantry Bay in December.

The Society of United Irishmen was a sworn association, formed in the wake of the French Revolution, to secure representative government in Ireland. Despairing of constitutional reform, and in defiance both of British Crown forces and of Irish sectarian division, in 1798 the United Irishmen instigated a republican rebellion. Their suppression was a prelude to the abolition of the Irish Parliament in Dublin and to Ireland's incorporation in a United Kingdom with Great Britain.