Calamus inermis (synonym C. wailong) is a species of flowering plant in the family Arecaceae. It is a liana native to Indochina (Laos, Myanmar, Thailand, and Vietnam), Yunnan and Hainan in China, northeastern India, and Bangladesh. Its natural habitat is subtropical or tropical seasonal forests. It is threatened by habitat loss.

The species was first described by Thomas Anderson in 1869.