Lough Ennell is a lake near the town of Mullingar, County Westmeath, Ireland. It is situated beside the N52 road, off the Mullingar/Kilbeggan road. The lake is part of the Lough Ennell Special Protection Area. It is 6.5 km (4.0 mi) long by 2 km (1.2 mi) wide, with an area of about 12 km2 (4.6 sq mi). Lough Ennell has a large area of shallow water with nearly two-thirds of its area being less than 25 feet and almost half of it being under 10 ft (3.0 m) deep. The lake produced Ireland's largest ever lake brown trout at 26 lbs (11.8 kg).

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.