| Official Name: | Winthrop, Indiana |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | USA Indiana Warren County#Indiana#USA |
| Pushpin Label: | Winthrop |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Warren |
| Subdivision Type3: | Township |
| Subdivision Name3: | Warren |
| Established Title: | Founded |
| Established Date: | 1884 |
| Founder: | Jacob M. Rhode |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Coordinates: | 40.37°N -87.2339°W |
| Elevation Ft: | 682 |
| Postal Code Type: | ZIP code |
| Postal Code: | 47993 |
| Area Code: | 765 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 446200 |
Winthrop is a small unincorporated community in Warren Township, Warren County, in the U.S. state of Indiana.
Winthrop was platted on March 3, 1884 by farmer Jacob Morgan Rhode (d. February 8, 1919);[1] the name probably comes from a personal name.[2] A north/south line of the Chicago and Eastern Illinois Railroad known as the "Coal Road" served the town in the late 19th and early 20th centuries. Operated after 1922 as the Chicago, Attica and Southern Railroad, it deteriorated in the 1930s and was scrapped around 1945.[3] Few traces of the route remain.
Winthrop is located about east of Indiana State Road 55 and about north of the county seat of Williamsport, at an elevation of approximately 680 feet. The West Fork of Kickapoo Creek flows to the west and south of town.