蚊帐，闽南语称蠓罩（báng-tà）是一种避免蚊子叮咬的帐幕，通常挂在床架上将床围住以隔绝蚊子。蚊帐多为网状材质，可通风。

人类多饱受蚊子叮咬之苦，《庄子·天运篇》说：“蚊虻噆肤，则通昔（夕）不寐矣。”齐桓公时已有“翠纱之帱”，《诗经·召南·小星》有“肃肃宵征，抱衾与裯”之语。赵学敏与陈寅恪早年常在蚊帐里看书，久之，患有眼疾。**的军队规定晚上必须挂蚊帐，为夜间 内务的一部分。

蚊帐是常用的避蚊日用品，现在市场上蚊帐种类繁多，不仅有圆顶的宫廷蚊帐，还有用轻质碳纤维制作的碳纤蚊帐。它们不用悬挂就可以直接在床上安置好，透气性能很好。使用蚊帐可以避蚊防风，还可吸附空气中飘落的尘埃。

A mosquito net offers protection against mosquitos, flies, and other insects, and thus against the diseases they may carry. Examples include malaria, dengue fever, yellow fever, and various forms of encephalitis, including the West Nile virus. To be effective the mesh of a mosquito net must be fine enough to exclude such insects without reducing visibility or air flow to unacceptable levels. It is possible to increase the effectiveness of a mosquito net greatly by treating it with an appropriate insecticide or mosquito repellant.