Rocklake is a city in Towner County, North Dakota, United States.

According to the United States Census Bureau, the city has a total area of 0.22 square miles (0.57 km2), all land.

61.9% of all households were made up of individuals, and 25.4% had someone living alone who was 65 years of age or older.

The racial makeup of the city was 95.88% White, 3.61% Native American, and 0.52% from two or more races.

24.5% were of German, 15.7% Finnish, 13.8% Swedish, 10.1% American, 8.8% Irish, 8.2% Norwegian, 5.0% English and 5.0% Scotch-Irish ancestry.

About 2.3% of families and 8.9% of the population were below the poverty line, including 9.8% of those under the age of eighteen and none of those 65 or over.