The N Seoul Tower, officially the YTN Seoul Tower commonly known as the Namsan Tower or Seoul Tower, is a communication and observation tower located on Namsan Mountain in central Seoul, South Korea. It marks the highest point in Seoul.

Built in 1969 the tower was opened to the public in 1980. Seoul Tower was completed on December 3, 1971, designed by Jangjongryul. By August 1975 there were open the third floor of the observatory room, museum, open hall and souvenir shop. After completion of the tower, the use of the observatory was prohibited. The tower was open to the public for the first time on October 15, 1980. Since then, the tower has been a landmark of Seoul. It measures 236.7 m in height from the base and tops out at 479.7 m above sea level. It changed its name to N Seoul Tower in 2005. The "N" stands for new, Namsan and nature.