The Diocese of Meath (Latin: Dioecesis Midensis; Irish: Deoise na Mí) is a Latin Church diocese of the Catholic Church that is located in the middle part of Ireland.

The principal towns are Ashbourne, Bettystown, Drogheda, Dunboyne, Laytown, Kells, Mornington, Mullingar, Navan and Tullamore.

The diocese covered roughly the western part of the Kingdom of Meath with the bishop's seat located at Clonard Abbey.

As Parnell was popular, this caused a backlash which eventually led to the cathedral removing to Mullingar, County Westmeath permanently.

The diocesan school, St. Finian's College also moved to Mullingar from Navan.