Ludlow is a New England town in Hampden County, Massachusetts, United States. The population was 21,002 as of the 2020 census, and it is considered part of the Springfield Metropolitan Statistical Area. Located just northeast of Springfield across the Chicopee River, it is one of the city's suburbs. It has a sizable and visible Portuguese and Polish community.

Hampden County is a non-governmental county located in the Pioneer Valley of the U.S. state of Massachusetts, in the United States. As of the 2020 census, Hampden County's population was 465,825. Its traditional county seat is Springfield, the Connecticut River Valley's largest city, and economic and cultural capital; with an estimated population of 154,758, approximately one-third of Hampden County residents live in Springfield.