Clanis bilineata, the two-lined velvet hawkmoth, is a species of moth in the family Sphingidae first described by Francis Walker in 1866.

It is found in Asia, but see the subspecies section for a detailed range.

Adults of the nominate subspecies are on wing from late February until October, with peaks in April, late July-early August, and mid-September in Hong Kong.

Subspecies C. b. tsingtauica is on wing from May to late September in Korea.

Larvae of the nominate subspecies have been recorded on Pongamia pinnata, Millettia atropurpurea and Pterocarpus marsupium in India.