The rusty-margined guan (Penelope superciliaris) is a species of bird in the family Cracidae, which includes the chachalacas, guans, and curassows. It is found in Argentina, Bolivia, Brazil, and Paraguay.
The rusty-margined guan is 55 to 73 cm long. The nominate subspecies weighs 950 to 1,150 g and P. s. jacupemba 750 to 880 g. The species' upperparts are dark olive to brownish with the eponymous reddish margins on the wing coverts and scapulars. The belly is also rusty. The face is pale with a supercilium whose color ranges from white to buff or ochre in the different subspecies. P. s. jacupemba paler overall than the nominate and P. s. major is darker.