Porter is a town in Westchester Township, Porter County, in the U.S. state of Indiana. The population was 4,858 at the 2010 census. Porter is in the Indiana Dunes ecosystem, which played a role in the creation of The Nature Conservancy, and inspired conservation efforts.

Westchester Township is one of twelve townships in Porter County, Indiana. It is included in the Calumet, Northwest Indiana, and Great Lakes regions. It is located on the southern shore of Lake Michigan, about 50 miles (80 km) southeast of Chicago. It stretches from the famous Indiana Dunes on its northern border, south to the Valparaiso Moraine, a ridge of rolling hills left by the last glacier to pass through the area. As of the 2010 census, its population was 19,396.