Anopheles sinensis is a species of mosquito that transmits malaria as well as lymphatic filariasis. It is regarded as the most important vector of these human parasitic diseases in Southeast Asia. It is the primary vector of vivax malaria (Plasmodium vivax) in many regions. In China it also transmits the filalarial parasite (Wuchereria bancrofti), and arthropod roundworm (Romanomermis jingdeensis). In Japan it is also a vector of a roundworm Setaria digitata in sheep and goats.