Seonyudo (Korean: 선유도; RR: Seonyudo) is an island in the Han River in Seoul, South Korea.

Seonyudo was a small mountain called Seonyubong.But, when Japanese colonial era, they were cut off, collecting rocks to stop the flood and pave the way.

With the construction of the Yanghwa Bridge from June 1962 to January 1965, Seonyubong completely disappeared.

[1] From 1978 to 2000, Seonyudo was used as a water filtration plant to supply tap water to the southwestern part of Seoul.

In December 2000, Seonyudo water filtration plant was closed and then a park was set up.