Usan-do (Korean: 우산도, 于山島) is a historical name for an island in the Sea of Japan described in Korean records. It was part of the ancient state of Usan-guk, but its exact identity is disputed. It may refer to:

• Jukdo, a Korean island 4 km east of Ulleungdo.
• The Liancourt Rocks, a disputed group of islets now known as Dokdo in Korea and Takeshima in Japan.

Old Korean maps of Usan-do

• Usan-do
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  Joseon map (1530)
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  Joseon map (1530): Ulleungdo (鬱陵島) and Usando (于山島)
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  Kim Jeong-ho "Daedongyeojido" (1861): Ulleungdo (鬱陵島) and Usando (于山)
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  Kim Jeong-ho "Daedongyeojido" (1861): East of Ulleungdo (鬱陵島) and Usando (于山)
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  A map by the Korean Empire (1899): Ulleungdo (鬱陵島) and Usan (于山) as Jukdo
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  Aerial photograph of Jukdo Island (for reference)