Urosaurus nigricauda is a species of lizard.

Common names for this species include the Baja California brush lizard, black-tailed brush lizard, and small-scaled tree lizard.

Its range includes southern California, Baja California, and nearby Pacific islands.

[1][2] Until 1999, the small-scaled lizard, Urosaurus microscutata, was considered a discrete species.

U. microscutata has since been identified as the same species, and a synonym of U.