KFFX may refer to:

• KFFX-TV, a television station (channel 11 analog/8 digital) licensed to Pendleton, Oregon, United States
• KFFX (FM), a radio station (104.9 FM) licensed to Emporia, Kansas, United States

• By heart (disambiguation)
• BYH (language)
• By Hook or By Crook
• By Hook or by Crook (film)
• Byhåla
• By Inferno's Light (Star Trek: Deep Space Nine)
• By Invitation Only
• BYJ (disambiguation)
• By Jiminy Ahoy
• By Jove
• BYK College
• BYKdb
• Bykivnia
• ByKolles Racing
• Bykomycin
• Bykova
• Bykovo (inhabited locality)
• Bykovo, Moscow Oblast
• Bykovo, Volgograd Oblast
• Bykovskaya
• Bykovski
• Bykovski District
• Bykovskii
• Bykovskii District
• Bykovskii Raion