KTTU (channel 18) is a television station in Tucson, Arizona, United States, affiliated with MyNetworkTV. It is owned by Tegna Inc. alongside Fox affiliate KMSB (channel 11); Tegna maintains a shared services agreement (SSA) with Gray Television, owner of CBS affiliate KOLD-TV (channel 13), for the provision of studio space and technical services while maintaining control of programming and sales. The stations share studios on North Business Park Drive on the northwest side of Tucson (near the Casas Adobes neighborhood), while KTTU's transmitter is located atop Mount Bigelow.