The Seongsu Bridge, sometimes spelled Sŏngsu Bridge, is a cantilever bridge over the Han River, connecting the Seongdong and Gangnam districts of Seoul, South Korea. The bridge began construction under Hyundai Engineering & Construction on April 26, 1995 and was opened to the public on July 3, 1997 by Seoul Mayor Cho Soon. The original Seongsu Bridge was built in 1979, and was demolished and rebuilt following the Seongsu Bridge disaster on October 21, 1994.

The Han River or Hangang is a major river in South Korea, with some of its tributaries and drainage basin in North Korea. It is the fourth longest river on the Korean peninsula after the Yalu ("Amnok"), Tumen ("Tuman"), and Nakdong rivers. The river begins as two smaller rivers in the eastern mountains of the Korean peninsula, which then converge near Seoul.