AT&T公司（英(ying)語：AT&T Inc.，原為American Telephone & Telegraph的縮寫，也是中文譯名(ming)美國(guo)(guo)電話電報公司由來，但近年來已(yi)不(bu)用全名(ming)），是一家美國(guo)(guo)電信公司，創建于1877年。 AT&T在近120年中，曾經過多次(ci)分拆和(he)重組。 AT&T也是是美國(guo)(guo)NBA聯盟(meng)圣安東尼奧馬刺的球(qiu)館英(ying)語名(ming)AT&T Center。

美國(guo)(guo)(guo)(guo)電(dian)話(hua)電(dian)報(bao)公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)有8個(ge)主要部門 ：貝(bei)(bei)(bei)爾(er)(er)(er)實驗室、商業(ye)(ye)市(shi)場集(ji)團(tuan)、數據(ju)系(xi)統公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si) 、通用(yong)市(shi)場集(ji)團(tuan) 、網絡運營集(ji)團(tuan)、網絡系(xi)統集(ji)團(tuan)、技術系(xi)統集(ji)團(tuan)、公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)國(guo)(guo)(guo)(guo)際集(ji)團(tuan)。主要業(ye)(ye)務(wu)(wu)是：為國(guo)(guo)(guo)(guo)內國(guo)(guo)(guo)(guo)際提(ti)(ti)供(gong)電(dian)話(hua)服務(wu)(wu)。利用(yong)海底電(dian)纜(lan)、海底光纜(lan)、通信(xin)衛星，可(ke)聯系(xi)250個(ge)國(guo)(guo)(guo)(guo)家和(he)地(di)(di)區(qu)，147個(ge)國(guo)(guo)(guo)(guo)家和(he)地(di)(di)區(qu)可(ke)直接撥號。提(ti)(ti)供(gong)商業(ye)(ye)機器、數據(ju)類(lei)(lei)產(chan)(chan)品(pin)和(he)消費類(lei)(lei)產(chan)(chan)品(pin)。提(ti)(ti)供(gong)電(dian)信(xin)網絡系(xi)統。各種服務(wu)(wu)及租賃(lin)業(ye)(ye)務(wu)(wu)。它(ta)還為政(zheng)府提(ti)(ti)供(gong)產(chan)(chan)品(pin)和(he)服務(wu)(wu)。該公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)非常重(zhong)視科(ke)研和(he)開發新(xin)(xin)(xin)產(chan)(chan)品(pin)。美國(guo)(guo)(guo)(guo)電(dian)話(hua)電(dian)報(bao)公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)在泰國(guo)(guo)(guo)(guo)、德(de)國(guo)(guo)(guo)(guo)、新(xin)(xin)(xin)加(jia)坡等(deng)地(di)(di)設有工廠。在意(yi)大(da)(da)利、韓國(guo)(guo)(guo)(guo)、日本等(deng)國(guo)(guo)(guo)(guo)設有子公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)或者(zhe)合資公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)。1995年(nian)9月，該公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)解(jie)體為三個(ge)獨立的(de)(de)公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)：通訊服務(wu)(wu)公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)、通訊設備公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)、電(dian)腦信(xin)息服務(wu)(wu)公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)，并且退(tui)出(chu)個(ge)人電(dian)腦領域。AT&T的(de)(de)瓦解(jie)過程開始于1984年(nian)。在美國(guo)(guo)(guo)(guo)政(zheng)府反壟斷政(zheng)策的(de)(de)強制干(gan)預下，公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)的(de)(de)本地(di)(di)電(dian)話(hua)業(ye)(ye)務(wu)(wu)被(bei)分裂出(chu)去，重(zhong)新(xin)(xin)(xin)組建了(le)7個(ge)子公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)，分別是：貝(bei)(bei)(bei)爾(er)(er)(er)太平洋公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)、Ameritech公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)、貝(bei)(bei)(bei)爾(er)(er)(er)西南公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)、貝(bei)(bei)(bei)爾(er)(er)(er)西部美國(guo)(guo)(guo)(guo)公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)、貝(bei)(bei)(bei)爾(er)(er)(er)大(da)(da)西洋公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)、貝(bei)(bei)(bei)爾(er)(er)(er)南方(fang)公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)和(he)Nynex公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)。