| Official Name: | Otter Lake, Indiana |
| Settlement Type: | Census-designated place |
| Pushpin Map: | Indiana#USA |
| Pushpin Label: | Otter Lake |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Indiana |
| Subdivision Type2: | County |
| Subdivision Name2: | Steuben |
| Subdivision Type3: | Township |
| Subdivision Name3: | Jackson |
| Area Footnotes: | [1] |
| Unit Pref: | Imperial |
| Area Total Sq Mi: | 0.67 |
| Area Land Sq Mi: | 0.50 |
| Area Water Sq Mi: | 0.17 |
| Population As Of: | 2020 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 935 |
| Coordinates: | 41.6367°N -85.1681°W |
| Postal Code Type: | ZIP code |
| Postal Code: | 46703 (Angola) |
| Area Code: | 260 |
| Blank Name: | FIPS code |
| Blank Info: | 18-57330 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2830546 |
Otter Lake is an unincorporated community and census-designated place (CDP) in Steuben County, Indiana, United States.
The community is in western Steuben County, surrounding Otter Lake, a natural water body. U.S. Route 20 forms the northern edge of the CDP; the highway leads east 9miles to Angola, the county seat, and west to LaGrange. Indiana State Road 327 forms the western edge of the community, leading north 6miles to Orland and south to Garrett.
According to the U.S. Census Bureau, the Otter Lake CDP has a total area of 0.67sqmi, of which 0.5sqmi are land and 0.17sqmi, or 25.37%, are water.[1] The lake's outlet is at its northern end, flowing into Pigeon Creek, which becomes the Pigeon River, a west-flowing tributary of the St. Joseph River leading to Lake Michigan.