AT&T公(gong)(gong)司（英語(yu)：AT&T Inc.，原為American Telephone & Telegraph的縮寫，也(ye)是中(zhong)(zhong)文譯名美國(guo)電(dian)(dian)話電(dian)(dian)報公(gong)(gong)司由來(lai)，但近年來(lai)已(yi)不用全名），是一(yi)家(jia)美國(guo)電(dian)(dian)信公(gong)(gong)司，創建于1877年。 AT&T在近120年中(zhong)(zhong)，曾經過多次分(fen)拆和重組(zu)。 AT&T也(ye)是是美國(guo)NBA聯(lian)盟圣安東尼奧馬刺的球館(guan)英語(yu)名AT&T Center。

美(mei)國(guo)(guo)電(dian)話電(dian)報(bao)公(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)有8個主要(yao)部門 ：貝(bei)爾(er)(er)實(shi)驗室、商業市場(chang)(chang)集團(tuan)(tuan)(tuan)、數據系(xi)統(tong)(tong)公(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si) 、通(tong)(tong)(tong)用市場(chang)(chang)集團(tuan)(tuan)(tuan) 、網絡運營集團(tuan)(tuan)(tuan)、網絡系(xi)統(tong)(tong)集團(tuan)(tuan)(tuan)、技術系(xi)統(tong)(tong)集團(tuan)(tuan)(tuan)、公(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)國(guo)(guo)際集團(tuan)(tuan)(tuan)。主要(yao)業務(wu)是(shi)：為(wei)國(guo)(guo)內國(guo)(guo)際提供電(dian)話服(fu)務(wu)。利用海底(di)電(dian)纜(lan)、海底(di)光纜(lan)、通(tong)(tong)(tong)信衛(wei)星，可聯系(xi)250個國(guo)(guo)家(jia)和(he)地(di)區(qu)，147個國(guo)(guo)家(jia)和(he)地(di)區(qu)可直接撥號。提供商業機器、數據類產(chan)品(pin)和(he)消費(fei)類產(chan)品(pin)。提供電(dian)信網絡系(xi)統(tong)(tong)。各(ge)種(zhong)服(fu)務(wu)及租賃業務(wu)。它(ta)還為(wei)政府(fu)提供產(chan)品(pin)和(he)服(fu)務(wu)。該公(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)非常重視(shi)科研和(he)開發(fa)新(xin)(xin)產(chan)品(pin)。美(mei)國(guo)(guo)電(dian)話電(dian)報(bao)公(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)在泰國(guo)(guo)、德國(guo)(guo)、新(xin)(xin)加(jia)坡等地(di)設有工廠(chang)。在意大利、韓國(guo)(guo)、日本等國(guo)(guo)設有子(zi)公(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)或者(zhe)合資公(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)。1995年(nian)9月，該公(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)解體(ti)為(wei)三個獨(du)立的(de)(de)公(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)：通(tong)(tong)(tong)訊服(fu)務(wu)公(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)、通(tong)(tong)(tong)訊設備(bei)公(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)、電(dian)腦信息服(fu)務(wu)公(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)，并且退出(chu)個人電(dian)腦領域。AT&T的(de)(de)瓦(wa)解過(guo)程開始于1984年(nian)。在美(mei)國(guo)(guo)政府(fu)反壟斷政策的(de)(de)強制干預下，公(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)的(de)(de)本地(di)電(dian)話業務(wu)被分裂出(chu)去，重新(xin)(xin)組建(jian)了7個子(zi)公(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)，分別是(shi)：貝(bei)爾(er)(er)太平洋(yang)公(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)、Ameritech公(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)、貝(bei)爾(er)(er)西南(nan)公(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)、貝(bei)爾(er)(er)西部美(mei)國(guo)(guo)公(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)、貝(bei)爾(er)(er)大西洋(yang)公(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)、貝(bei)爾(er)(er)南(nan)方公(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)和(he)Nynex公(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)。