Winthrop is a dispersed rural community in Huron East, Huron County, Ontario, Canada.
Winthrop was settled in 1834 by the Govenlock family. A post office opened in 1868, and by the 1870s, Winthrop contained a telegraph office, hotel, Presbyterian church, tavern, school, brickyard, two blacksmiths, a sawmill, a grist and flour mill, and a cheese and butter factory. Daily mail arrived by stage coach.
The post office closed in 1915.