Harker Lake is a shallow glacial lake located in Kidder County, North Dakota, United States. It is 5 km (3.1 mi) south-southeast of the town of Dawson, North Dakota, and 80.5 km (50.0 mi) east of the state capital, Bismarck. The lake is entirely surrounded by the wetlands and marshes of the Slade National Wildlife Refuge, and public access is limited.