Asaccus arnoldi is a species of lizard in the family Phyllodactylidae. It, along with all other species in the genus Asaccus, is endemic to the Hajar Mountains of northern Oman.
Asaccus arnoldi is the smallest species in the genus Asaccus. The maximum recorded snout-to-vent length (SVL) of A. arnoldi is only 33.6 mm (1.32 in). It is most closely related to Asaccus gallagheri.
