Walnut Township is one of ten townships in Adair County, Missouri, United States. At the 2020 census, its population was 219. Walnut Township was named from the old-growth forests of walnut it contained at the time of settlement.
Walnut Township covers an area of and contains no incorporated settlements.
The streams of Little Mussel Creek and Little Walnut Creek run through this township.
Walnut Township is a township in Adair County, Missouri, organized in 1865. It was named for the extensive walnut forests originally found in the area.