Southeast University (SEU) is located in Nanjing, the capital city of Jiangsu Province, China. The English address for the main campus is:

Southeast University,

Xuanwu District,

Nanjing,

China.

This address refers to the historic Sipailou Campus, which is the central hub of SEU and houses several key administrative offices, as well as academic departments. The university has other campuses within the city of Nanjing, each with its own specific English address. However, the above address is widely recognized as the primary location of Southeast University.