Gaolan County is an administrative division located in Gansu Province, China. It is one of the 58 counties within the province and falls under the jurisdiction of the prefecture-level city of Lanzhou, which serves as the provincial capital.
The county has a postal code of 730200. As of 2019, the population of Gaolan County was recorded at 147,000 people, representing a 13% decrease from its reported population in 1999.