"Futabasaurus" is an informal name for a genus of theropod dinosaur from the Late Cretaceous of Japan, known only from a partial shin bone discovered in the Coniacian-age Ashizawa Formation of the Futaba Group. It was coined by David Lambert in 1990 as a conversion from the Japanese nickname "Futaba-ryu", for an undescribed theropod. Dong Zhiming and coauthors briefly discussed the fossil shin bone it was based on that same year, publishing a photograph. They considered the bone to belong to an indeterminate tyrannosaurid. If the specimen is eventually described and named, it will require a different name, because the name Futabasaurus has since been used for a genus of plesiosaur.
- Mortimer, Michael (2008). "Neotheropoda". The Theropod Database. Retrieved 2009-11-17.
- Lambert, David; the Diagram Group (1990). The Dinosaur Data Book. New York: Avon Books. pp. 63, 250. ISBN 0-380-75896-2.
- Dong, Zhiming; Y. Hasegawa; Y. Azuma (1990). The Age of Dinosaurs in Japan and China. Fukui, Japan: Fukui Prefectural Museum. p. 65 pp.
- Sato, Tamaki; Hasegawa, Yoshikazu; Manabe, Makoto (2006). "A new elasmosaurid plesiosaur from the Upper Cretaceous of Fukushima, Japan". Palaeontology 49 (3): 467–484. doi:10.1111/j.1475-4983.2006.00554.x.
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