The blue-gray mouse (Pseudomys glaucus) is an Australian rodent species that is only known by a few specimens found in Eastern Australia, and since presumed to have become extinct.

[2] The number of specimens identified as Pseudomys glaucus is limited to three, two found in the northeastern state of Queensland and a single specimen collected to the south at Cryon in New South Wales.

A species of Pseudomys, these Australian rodents resembled the familiar house mouse (Mus musculus).

The body of P. glaucus was robust with fine and dense fur, white at the underside and a pale blue-grey colour over the upperparts of the fur.

The measurement of each of the three known specimens was 95 millimetres for the head and body combined, with a white-haired tail that was slightly longer (100 mm.)