Winthrop is a city in Little River County, Arkansas, United States. The population was 186 at the 2000 census. The city was also home of Winthrop Rockefeller's election campaigns.
Winthrop is located at 33°49′51″N 94°21′16″W / 33.83083°N 94.35444°W / 33.83083; -94.35444 (33.830750, -94.354330).
According to the United States Census Bureau, the city has a total area of 1.1 square miles (2.8 km²), all of it land.