During a faunistic survey of the inland water sources of the Sinai Peninsula the following mosquito species were found: Culex pusillus Macquart, C. arbieeni Salem, C. deserticola Kirkpatrick, C. laticinctus Edwards, C. mimeticus Noé, C. Pipiens molestus Forskal, C. sinaiticus Kirkpatrick, C. theileri Theobald, Aedes caspius (Pallas), Ae. detritus (Haliday), Culiseta longiareolata (Macquart), Uranotaenia unguiculata Edwards, Anopheles dthali Patton, An. hispaniola (Theobald), An. multicolor Cambouliu, An. Pharoensis Theobald, An. rhodesiensis rupicolus Lewis, An. sergentii (Theobald), An. superpictus Grassi and An. turkhudi Liston. Cu. longiareolata, An. sergentii and C. sinaiticus were predominant all over Sinai. Ae. caspius, C. pusillus and An. multicolor which prefer waters of high salinity were found mainly in the coastal regions, while C. arbieeni, An. turkhudi and An. hispaniola were predominant in the mountainous areas. An. sergentii and An. superpictus were incriminated as the major vectors of malaria in Sinai. This is the first record of C. mimeticus, Ae. detritus and An. hispaniola in Sinai.