| Official Name: | Lamar Township |
| Settlement Type: | Township |
| Pushpin Map: | Arkansas |
| Pushpin Map Caption: | Location in Arkansas |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Madison |
| Established Title: | Established |
| Established Date: | 1878[1] |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 28.14 |
| Area Land Sq Mi: | 28.01 |
| Area Water Sq Mi: | 0.13 |
| Population As Of: | 2010 |
| Population Total: | 949 |
| Population Density Sq Mi: | 33.9 |
Lamar Township is one of 21 inactive townships in Madison County, Arkansas, USA. As of the 2010 census, its population was 949.[2]