| Official Name: | Washington Township Gibson County |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Gibson |
| Subdivision Type3: | Township Seat |
| Subdivision Name3: | (None) Patoka in White River Township serves as seat. |
| Subdivision Type5: | School District |
| Subdivision Name5: | North Gibson School Corporation |
| Government Type: | Indiana township |
| Leader Title: | Trustee |
| Leader Name: | Tony Shroeder |
| Area Total Sq Mi: | 36.79 |
| Area Land Sq Mi: | 36.34 |
| Area Water Sq Mi: | 0.44 |
| Population As Of: | 2020 |
| Population Total: | 731 |
| Population Density Sq Mi: | auto |
| Timezone: | CST |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Footnotes: | [1] |
| Elevation M: | 152 |
| Elevation Ft: | 499 |
| Coordinates: | 38.4447°N -87.4725°W |
| Postal Code Type: | ZIP codes |
| Postal Code: | 47567, 47640, 47649, 47666, 47670 |
| Area Code: | 812 |
| Blank Name: | FIPS code |
| Blank Info: | 18-80612[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 453995 |
| Footnotes: | Washington Township is one of two townships in Gibson County that has no Zip Code or Township Seat. Although Oatsville, on the county line with Pike County has its own code. |
| Named For: | George Washington |
Washington Township is one of ten townships in Gibson County, Indiana. As of the 2020 census, its population was 731 (down from 785 at 2010[3]) and it contained 326 housing units.[4] Like Wabash Township, Washington Township also has no organized seat within the township, despite its two corporation-worthy towns Mount Olympus and Wheeling. Patoka, in White River Township, serves as the seat.
Washington Township was organized in 1824, and named for President George Washington.[5]
The Trippett-Glaze-Duncan-Kolb Farm was listed on the National Register of Historic Places in 1993, with a boundary increase in 2009.
According to the 2010 census, the township has a total area of, of which (or 98.78%) is land and (or 1.20%) is water.[3]
The township contains five cemeteries: Armstrong, Kirk, Kirk-McRoberts, Phillips and Richardson.
Washington Township is served by the North Gibson School Corporation although not having any schools of its own since the early 1970s.