An artist's illustration of "Lancanjiangosaurus cachuensis"

"Lancanjiangosaurus" (alternative spelling "Lanchanjiangosaurus"; meaning "Lancangjiang lizard", named after the Lancangjiang River of China) is the informal name given to an as yet undescribed genus of sauropod dinosaur from the Middle Jurassic. The "type species", "Lancanjiangosaurus cachuensis", was coined by Zhou in 1985, but remains a nomen nudum. It is known from the Dapuka Group of Tibet. As the name has been undescribed for so long, the remains may have been named something else by now.

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