Harriet-Lein Township is a township in Burleigh County, North Dakota, United States. The population was 53 at the 2020 census.
The unincorporated community of Arena lies within Harriet-Lein Township.
Harriet-Lein Township has a total area of , of which is land and is water.
As of the 2023 American Community Survey, there were an estimated 18 households.