Culex (Culex) gelidus is a species of mosquito belonging to the genus Culex.

It is found in India, Sri Lanka,[1] Bangladesh, Cambodia, China, Hong Kong, India, Indonesia, Japan, Laos, Malaysia, Myanmar, Nepal, New Guinea (Island); Papua New Guinea, Pakistan, Philippines, Taiwan, Thailand, Vietnam.

[2][3] In 1976, it was identified as a major vector of Japanese encephalitis virus, in India.

[4] From an experiment, it was evident that aqueous solution of Calotropis gigantea leaves possess larvicidal activity, mosquito repellent activity and ovicidal activity against Culex gelidus.

[5]