| Official Name: | Otter Tail Township, Minnesota |
| Settlement Type: | Township |
| Pushpin Map: | Minnesota#USA |
| Pushpin Label Position: | left |
| Pushpin Map Caption: | Location within the state of Minnesota |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Minnesota |
| Subdivision Type2: | County |
| Subdivision Name2: | Otter Tail |
| Unit Pref: | Imperial |
| Area Total Km2: | 78.8 |
| Area Land Km2: | 42.4 |
| Area Water Km2: | 36.4 |
| Area Total Sq Mi: | 30.4 |
| Area Land Sq Mi: | 16.4 |
| Area Water Sq Mi: | 14.1 |
| Population As Of: | 2000 |
| Population Total: | 556 |
| Population Density Km2: | 13.1 |
| Population Density Sq Mi: | 34.0 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation M: | 410 |
| Elevation Ft: | 1345 |
| Coordinates: | 46.3964°N -95.6039°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 56571 |
| Area Code: | 218 |
| Blank Name: | FIPS code |
| Blank Info: | 27-49228[1] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 0665239[2] |
Otter Tail Township is a township in Otter Tail County, Minnesota, United States. The population was 556 at the 2000 census.
Otter Tail Township was organized in 1870, and named after Otter Tail Lake.[3]
According to the United States Census Bureau, the township has a total area of 30.4 square miles (78.8 km), of which 16.4 square miles (42.4 km) is land and 14.1 square miles (36.4 km) (46.25%) is water.
As of the census of 2000, there were 556 people, 241 households, and 187 families residing in the township. The population density was 34sp=usNaNsp=us. There were 644 housing units at an average density of 39.4sp=usNaNsp=us. The racial makeup of the township was 98.74% White, 0.36% Native American, 0.18% Asian, 0.54% Pacific Islander, and 0.18% from two or more races. Hispanic or Latino of any race were 1.08% of the population.
There were 241 households, out of which 22.4% had children under the age of 18 living with them, 69.7% were married couples living together, 6.2% had a female householder with no husband present, and 22.0% were non-families. 19.5% of all households were made up of individuals, and 7.9% had someone living alone who was 65 years of age or older. The average household size was 2.31 and the average family size was 2.63.
In the township the population was spread out, with 18.3% under the age of 18, 3.8% from 18 to 24, 19.4% from 25 to 44, 35.6% from 45 to 64, and 22.8% who were 65 years of age or older. The median age was 51 years. For every 100 females, there were 95.1 males. For every 100 females age 18 and over, there were 96.5 males.
The median income for a household in the township was $37,000, and the median income for a family was $38,667. Males had a median income of $28,250 versus $21,875 for females. The per capita income for the township was $21,931. About 8.9% of families and 9.1% of the population were below the poverty line, including 12.7% of those under age 18 and 4.2% of those age 65 or over.