99X

99X may refer to:

• KKPS, a radio station (99.5 FM) licensed to Brownsville, Texas, United States, which branded itself 99X under the callsign KRIX during the 1980s
• KTUX, a radio station (98.9 FM) licensed to Carthage, Texas, United States, currently branded 99X
• KXFT, a radio station (99.7 FM) licensed to Mason, Iowa, United States, which branded itself 99X from 2007–2009
• WEPN-FM, a radio station (98.7 FM) licensed to New York, New York, United States, which branded itself 99X under the callsign WXLO during the 1970s
• WJBX, a radio station (99.3 FM) licensed to Fort Meyer Beach, Florida, United States, currently branded 99X
• WMMS-HD2 and W256BT, an HD Radio digital subchannel (100.7 HD2) and a radio translator (99.1 FM) — both licensed to Cleveland, Ohio, United States — which currently simulcast as 99X
• WWWQ, a radio station (99.7 FM) licensed to Atlanta, Georgia, United States, which branded itself 99X under the callsign WNNX from 1992–2008
• 99X (Atlanta), a former HD Radio digital subchannel (WWWQ FM 99.7-HD2) and radio translator (W255CJ FM 98.9) — both licensed to Atlanta, Georgia, United States — which simulcasted as 99X, and aired on 99.7 in analog from 1992 to 2008
• WXNR, a radio station (99.5 FM) licensed to Grifton, North Carolina, United States, which branded itself 99X during the 1990s