Emoia atrocostata, commonly known as the littoral whiptail-skink, mangrove skink, or littoral skink, is a species of lizard in the family Scincidae.

It inhabits mangroves, back-beach vegetation and rocky shorelines.

[3][4] The species can be distinguished from the similar many-lined sun skink by the lack of keeled scales on the dorsal surface of the Mangrove Skink.

The throat is often bluish, and the belly greenish or yellow to orange.

[5] E. atrocostata can be found on the Ryukyu Islands, Taiwan, the Philippines, Indonesia, Malaysia, Vietnam, Papua New Guinea, the Solomon Islands, Vanuatu and in Queensland, Australia.