| Official Name: | Nettle Lake, Ohio |
| Settlement Type: | Census-designated place |
| Pushpin Map: | Ohio#USA |
| Pushpin Label: | Nettle Lake |
| Coordinates: | 41.6786°N -84.7269°W |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Ohio |
| Subdivision Type2: | County |
| Subdivision Name2: | Williams |
| Subdivision Type3: | Township |
| Subdivision Name3: | Northwest |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Sq Mi: | 0.37 |
| Area Land Sq Mi: | 0.26 |
| Area Water Sq Mi: | 0.11 |
| Area Total Km2: | 0.95 |
| Area Land Km2: | 0.66 |
| Area Water Km2: | 0.29 |
| Population As Of: | 2020 |
| Population Total: | 210 |
| Population Density Sq Mi: | 823.53 |
| Population Density Km2: | 318.48 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 942 |
| Postal Code Type: | ZIP Code |
| Postal Code: | 43543 (Montpelier) |
| Area Code: | 419/567 |
| Blank Name: | FIPS code |
| Blank Info: | 39-53914 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2628938 |
Nettle Lake is an unincorporated community and census-designated place (CDP) in Williams County, Ohio, United States, around the south end of the lake of the same name. It was first listed as a CDP following the 2010 census.
The CDP is in the northwest corner of Ohio, in the northern part of Williams County's Northwest Township. It is south of the Michigan border, 4miles east of the Indiana border, and northwest of Montpelier, Ohio. Nettle Lake drains out of its northern end into Nettle Creek, which flows southeast to the St. Joseph River, a southwest-flowing major tributary of the Maumee River, which flows northeast to Lake Erie at Toledo.