Arboviruses on Incirlik Air Base, Turkey, pose a threat to military personnel and civilians, but might also be relevant for understanding the threats in neighboring conflict zones such as Syria. We reviewed 6 years of mosquito and arbovirus surveillance at Incirlik Air Base. Over 6,000 mosquitoes were identified as Aedes caspius, Anopheles claviger, Culex mimeticus, Cx. perexiguus, Cx. pipiens, Cx. sinaiticus, and Culiseta longiareolata. Almost all of the mosquitoes (more than 90%) were Cx. perexiguus or Cx. pipiens. Both West Nile virus and Sindbis virus were detected in 6 mosquito pools among collections made in 2013, 2014, and 2015.