The Guadalcanal rat (Uromys porculus) is a species of rodent in the family Muridae.

[1] The only known skull of the Guadalcanal rat is clearly elongate and narrow, but has the molars so worn that few details of the crown remain.

[2] The only known specimen of Guadacanal rat was described in 1904 by Oldfield Thomas, although it was most likely collected at or around the same time as similar species Uromys rex and Uromus imperator in the late 1880s.

The species was registered in 1889 and was collected by Charles Morris Woodford at Aola village in the Solomon Islands.

[1] When it was first named in 1904 by Oldfield Thomas, the Guadacanal rat was described as a species of Uromys.