| Official Name: | Lamar Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Missouri |
| Subdivision Type2: | County |
| Subdivision Name2: | Barton |
| Area Total Km2: | 167.72 |
| Area Land Km2: | 166.9 |
| Area Water Km2: | 0.82 |
| Area Total Sq Mi: | 64.76 |
| Area Land Sq Mi: | 64.44 |
| Area Water Sq Mi: | 0.32 |
| Area Water Percent: | 0.49 |
| Population As Of: | 2000 |
| Population Total: | 1569 |
| Population Density Km2: | 9.4 |
| Population Density Sq Mi: | 24.3 |
| Elevation M: | 303 |
| Elevation Ft: | 994 |
| Coordinates: | 37.4956°N -94.2503°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0766279 |
Lamar Township is a township in Barton County, Missouri, United States. As of the 2000 census, its population was 1,569. The township completely surrounds, but does not include, the city of Lamar, Missouri.
Lamar Township covers an area of 64.76sqmi and contains one incorporated settlement, Lamar Heights. According to the USGS, it contains four cemeteries: Fair View, Lake, Nigh and Saint Marys.
The streams of Dicks Fork, Elm Branch and Pettis Creek run through this township.
Lamar Township contains one airport, Lamar Municipal Airport.