Longwood, historically called Moydervy, is a village in southwest County Meath, Ireland. It is located about 15 km south of the town of Trim on the R160 regional road. It is about 50 km from Dublin, off the N4 road. In the early years of the 21st century the population of Longwood increased dramatically, with the population more than trebling from 480 inhabitants as of the 2002 census, to 1,581 people as of the 2016 census; the 2016 census indicated that 65% of homes in the village were built between 2001 and 2010.

The Royal Canal is a canal originally built for freight and passenger transportation from Dublin to Longford in Ireland. It is one of two canals from Dublin to the River Shannon and was built in direct competition to the Grand Canal. The canal fell into disrepair in the late 20th century, but much of it has since been restored for navigation. The length of the canal to the River Shannon was reopened on 1 October 2010, but a final spur branch, to Longford Town, remains closed.