The National University of Ireland, Maynooth, commonly known as Maynooth University (MU), is a constituent university of the National University of Ireland in Maynooth, County Kildare, Ireland. It was Ireland's youngest university until Technological University Dublin was established in 2019, having been founded by the Universities Act, 1997, from the secular faculties of the now separate St Patrick's College, Maynooth, which was founded in 1795. Maynooth is also the only university town in Ireland, all other universities being based within cities.

The National University of Ireland (NUI) is a federal university system of constituent universities and recognised colleges set up under the Irish Universities Act 1908, and significantly amended by the Universities Act, 1997.