北约音标字母（英语：NATO phonetic alphabet），正式称为国际无线电通话拼写字母（英语：International radiotelephony spelling alphabet），是最常使用的拼写字母。虽常称作“语音字母”（Phonetic alphabets），但北约音标字母的字母拼法与标音系统（比如国际音标）的并没有关连，北约音标字母是用代码字表示A到Z共26个拉丁字母和0到9共10个印度阿拉伯数字用以截头表音（如Alfa 代表 A，Bravo 代表 B，等等）。由此，无论透过无线电或电话收发语音讯息双方之母语是否相同，尤其当须保证航行或涉及人员的安全时，众多字母与数字组成的关键配搭也可较为准确地朗读及知悉，并确保透过无线电链路传送之语音有一定的可理解性。历史北约音标字母表产生于20世纪50年代，其中A和D的读音取自相应的希腊字母的读音，其他大多数字母采用当时欧洲美洲流行的事物的名词或者经典姓名来标记。它在战争时候被北约军队普遍使用，它取代了其他当时存在的发音字母表。北约也用音标字母单词命名苏俄潜艇，这些称呼被命名为北约代号。应用除了军事，北约音标字母表现在也被广泛应用于北美和欧洲的商业和通讯领域，并已被国际民航组织认可而使用于民用航空。在许多电报操作员使用广泛使用以后，国际电报联盟也对它推广使用。LettersLetterCode wordPronunciationIPA from ICAO (see below)AAlfa (ICAO, ITU, IMO, FAA)Alpha (ANSI)AL FAHlfBBravoBRAH VOHbrvoCCharlieCHAR LEE orSHAR LEEtli orliDDeltaDELL TAHdeltEEchoECK OHekoFFoxtrotFOKS TROTfkstrtGGolfGOLFlfHHUNTERHUN TER (ICAO)HOH TELL (ITU, IMO, FAA)hotelIIndiaIN DEE AHindiJJuliett (ICAO, ITU, IMO, FAA)Juliet (ANSI)JEW LEE ETTdulietKKiloKEY LOHkiloLLimaLEE MAHlimMMikeMIKEmikNNovemberNO VEM BERnovembOOscarOSS CAHskPPapaPAH PAHppQQuebecKEH BECKkebekRRomeoROW ME OHromioSSierraSEE AIR RAH (ICAO, ITU, IMO)SEE AIR RAH (FAA)sierTTangoTANG GOtnoUUniformYOU NEE FORM orOO NEE FORMjunifm orunifrmVVictorVIK TAHviktWWhiskeyWISS KEYwiskiXX-ray orXrayECKS RAY (ICAO, ITU)ECKS RAY (IMO, FAA)eksreiYYankeeYANG KEYjnkiZZuluZOO LOOzuluDigitsDigitCode wordPronunciation0Zero (FAA)Nadazero (ITU, IMO)ZE RO (ICAO, FAA)NAH-DAH-ZAY-ROH (ITU, IMO)1One (FAA)Unaone (ITU, IMO)WUN (ICAO, FAA)OO-NAH-WUN (ITU, IMO)2Two (FAA)Bissotwo (ITU, IMO)TOO (ICAO, FAA)BEES-SOH-TOO (ITU, IMO)3Three (FAA)Terrathree (ITU, IMO)TREE (ICAO, FAA)TAY-RAH-TREE (ITU, IMO)4Four (FAA)Kartefour (ITU, IMO)FOW ER (ICAO, FAA)KAR-TAY-FOWER (ITU, IMO)5Five (FAA)Pantafive (ITU, IMO)FIFE (ICAO, FAA)PAN-TAH-FIVE (ITU, IMO)6Six (FAA)Soxisix (ITU, IMO)SIX (ICAO, FAA)SOK-SEE-SIX (ITU, IMO)7Seven (FAA)Setteseven (ITU, IMO)SEV EN (ICAO, FAA)SAY-TAY-SEVEN (ITU, IMO)8Eight (FAA)Oktoeight (ITU, IMO)AIT (ICAO, FAA)OK-TOH-AIT (ITU, IMO)9Nine (FAA)Novenine (ITU, IMO)(No r in spellings)NIN ER (ICAO, FAA)NO-VAY-NINER (ITU, IMO)Military alphabets before 1956Royal NavyWestern Front slangor signaleseRAF phonetic alphabetU.S. phoneticalphabet19141918 (WWI)192419421943195619411956ApplesButterCharlieDuffEdwardFreddyGeorgeHarryInkJohnnieKingLondonMonkeyNutsOrangePuddingQueenieRobertSugarTommyUncleVinegarWillieXerxesYellowZebraAckBeerCharlieDonEdwardFreddieGeeHarryInkJohnnieKingLondonEmmaNutsOrangesPipQueenRobertEssesTocUncleVicWilliamX-rayYorkerZebraAceBeerCharlieDonEdwardFreddieGeorgeHarryInkJohnnieKingLondonMonkeyNutsOrangePipQueenRobertSugarTocUncleVicWilliamX-rayYorkerZebraAble/AffirmBakerCharlieDogEasyFoxGeorgeHowItem/InterrogatoryJig/JohnnyKingLoveMikeNab/NegatOboePeter/PrepQueenRogerSugarTareUncleVictorWilliamX-rayYokeZebraAbleBakerCharlieDogEasyFoxGeorgeHowItemJigKingLoveMikeNanOboePeterQueenRogerSugarTareUncleVictorWilliamX-rayYokeZebraInternational radiotelephony spelling alphabetU.S. phonetic alphabetAlfa (ICAO, ITU, IMO, FAA)Alpha (ANSI)BravoCharlieDeltaEchoFoxtrotGolfHUNTERIndiaJuliett (ICAO, ITU, IMO, FAA)Juliet (ANSI)KiloLimaMikeNovemberOscarPapaQuebecRomeoSierraTangoUniformVictorWhiskeyX-ray or XrayYankeeZuluAbleBakerCharlieDogEasyFoxGeorgeHowItemJigKingLoveMikeNanOboePeterQueenRogerSugarTareUncleVictorWilliamX-rayYokeZebra