蠓科（学名：Ceratopogonidae），又名糠蚊或沙蚊（主要在澳大利亚的北领地使用），是蚊下目之下的一个科。本科物种体形细小，身长一般在1–4 mm之间。与同属摇蚊总科（Chironomoidea）的山蚋科（Thaumaleidae）、蚋科（Simulidae）及摇蚊科（Chironomidae）等物种关系密切。

他们在世界各地几乎任何水栖或半水栖及在山区找到牠们的栖息地。几乎所有物种的雌虫均会以某种动物为宿主来吸血。 库蠓属（Culicoides）、蠛蠓属（Forcipomyia及细蠓（Leptoconops）主要吸有脊椎动物的血。有些Atrichopogon及蠛蠓属物种是其他较大型的昆虫的外寄生虫（ectoparasite）。 Dasyhelea species feed exclusively on nectar. Species in other genera are predatory on other small insects. Larvae are always found in some damp location, such as under bark, in rotten wood, compost, mud, stream margins, tree holes, or water-holding plants (i.e., phytotelmata).

Ceratopogonidae, or biting midges, are a family of small flies (1–4 mm long) in the order Diptera. They are also known as no-see-ums, midgies, sand flies, punkies, and others in North America, and sandflies in Australia. They are closely related to the Chironomidae, Simuliidae (or black flies), and Thaumaleidae.