Round Lake is a city in Nobles County, Minnesota, United States. The population was 376 at the 2010 census.

According to the United States Census Bureau, the city has a total area of 1.04 square miles (2.69 km), of which 1.03 square miles (2.67 km²) is estate and 0.01 square miles (0.03 km) is water. A lake, also called Round Lake, is just outdoor the city to the northeast. The town of Round Lake is located in the extreme southeast corner of Nobles County. It lies one-half miles west of the Jackson County line, and two miles (3 km) north of Iowa.

Main highways include:

Founding of Round Lake: Round Lake was received in 1882 later the Burlington Railroad built a heritage connecting Lake Park, Iowa, to Worthington, Minnesota. A site for a railroad station was fixed in slip of 1882, and the initial unconventional of name was Indian Lake, after the township in which it was located. However, a rich Chicago Board of Trade operator named Mr. O. H. Roche donated 20 acres (81,000 m) of estate for a townsite, and it was his wish that it be called Round Lake. Mr. Roche owned approximately 2,000 acres (8.1 km²) of land upon nearby Round Lake in Jackson County, and he was apparently loving of the make known Round Lake. A town was platted in December 1882 and the site was divided into 100 lots, not one of which were sold. Only two buildings were built in that first year, and both were build up by the railroad. The railroad section foreman and his crew were the and no-one else residents of the other town, until October 1883 in the look of E. A. Tripp came to town to consent duties as station agent. A state office named Indian Lake was acknowledged in March 1884, and Mr. Tripp became the postmaster. When unusual post office as soon as the say Round Lake (located on Round Lake in Jackson County) was closed, the publish office in the town of Round Lake assumed the herald of that town. A few businesses moved to town, but by 1887, the town had a mere 34 residents. In 1889, the town was re-platted, correcting some authenticated issues in imitation of the indigenous plat, and real growth began. Nine years later, Round Lake boasted numerous businesses, a bank, a newspaper, and 179 residents. Residents voted to incorporate the town, and upon October 11, 1898, the first election was held, and town government began below President A. F. Diehn. A new $2,000 bookish was erected at this time.