Wyndmere is a city in Richland County, North Dakota, United States. The population was 454 at the 2020 census. Wyndmere was founded in 1883 and named after Windermere in England. It is part of the Wahpeton, ND–MN Micropolitan Statistical Area.

Richland County is a county in the far southeast corner of the U.S. state of North Dakota. As of the 2020 census, the population was 16,529. Its county seat is Wahpeton.