County Westmeath is a county in Ireland. It is in the province of Leinster and is part of the Eastern and Midland Region. It formed part of the historic Kingdom of Meath, which was named Mide because the kingdom was located in the geographical centre of Ireland. Westmeath County Council is the administrative body for the county, and the county town is Mullingar. At the 2022 census, the population of the county was 95,840.

Leinster is one of the four provinces of Ireland, in the southeast of Ireland.