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Temporal range: Late Cretaceous, 83–74 Ma
Alectrosaurm olseni.jpg
Right hind foot of Alectrosaurus olseni. No. 6368, A.M.N.H.
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Clade: Saurischia
Clade: Theropoda
Superfamily: Tyrannosauroidea
Genus: Alectrosaurus
Gilmore, 1933
A. olseni
Binomial name
Alectrosaurus olseni
Gilmore, 1933

Alectrosaurus is a theropod dinosaur related to Tyrannosaurus, Alioramus and Tarbosaurus. It lived in Mongolia about 83-74 million years ago. Alectrosaurus as a genus existed for about 9 million years.