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 64.76 square miles (167.7 km) 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.

• USGS Geographic Names Information System (GNIS)

• US-Counties.com
• City-Data.com