99X

99X may refer to:

• KKPS, a radio station (99.5 FM) licensed to Brownsville, Texas, United States, which was branded 99X under the callsign KRIX during the 1980s
• KTUX, a radio station (98.9 FM) licensed to Carthage, Texas, United States, which was branded 99X during different periods from 1993 to 2018
• KXFT, a radio station (99.7 FM) licensed to Mason, Iowa, United States, which was branded 99X from 2007 to 2009
• WEPN-FM, a radio station (98.7 FM) licensed to New York, New York, United States, which was branded 99X under the callsign WXLO during the 1970s
• WMMS-HD2 and W256BT, an HD Radio digital subchannel (100.7-2 FM) and its low-power analog translator (99.1 FM) – both licensed to Cleveland, Ohio, United States – which were branded 99X from 2012 to 2017
• WWCN, a radio station (99.3 FM) licensed to Fort Myers Beach, Florida, United States, formerly branded 99X
• WWWQ, a radio station (99.7 FM) licensed to Atlanta, Georgia, United States, which was branded 99X under the callsign WNNX from 1992 to 2008
• WWWQ-HD2 and W255CJ, an HD Radio digital subchannel (99.7-2 FM) and its low-power analog translator (98.9 FM) – both licensed to Atlanta, Georgia, United States – which have been branded 99X since 2008
• WXNR, a radio station (99.5 FM) licensed to Grifton, North Carolina, United States, which was branded 99X during the 1990s