Eubrachiosaurus is an extinct genus of stahleckeriid dicynodont known from the Late Triassic (Carnian stage) of Wyoming, United States.

Lucas and Hunt (1993) considered both taxa junior synonyms of Placerias hesternus, which is known from the same formation, a position maintained in most subsequent studies.

[1] Kammerer et al. (2013) also noted that Williston (1904) described Brachybrachium on the basis of a fragmentary humerus from the upper Popo Agie beds, in "almost identically the same horizon" as Eubrachiosaurus.

Furthermore, the traits on which basis Williston used to distinguish the two taxa are either known to vary intraspecifically in kannemeyeriiforms or were too badly preserved in Brachybrachium to display clear morphological differences from Eubrachiosaurus.

Thus, Kammerer et al. (2013) concluded the it is probable that these two taxa are synonymous, but noted that on a strict apomorphy basis Brachybrachium brevipes must be considered a nomen dubium.