AT&T公司（英語(yu)：AT&T Inc.，原為American Telephone & Telegraph的縮寫，也(ye)是中文譯(yi)名(ming)美國電話電報公司由(you)來，但近(jin)年(nian)來已(yi)不用全名(ming)），是一(yi)家(jia)美國電信公司，創建于(yu)1877年(nian)。 AT&T在近(jin)120年(nian)中，曾經(jing)過多次分拆和重組(zu)。 AT&T也(ye)是是美國NBA聯盟圣安(an)東尼(ni)奧馬刺的球館英語(yu)名(ming)AT&T Center。

美國(guo)(guo)電(dian)(dian)(dian)(dian)話(hua)電(dian)(dian)(dian)(dian)報(bao)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)有(you)(you)8個(ge)主要部(bu)門 ：貝(bei)爾實驗(yan)室、商業(ye)(ye)市場集團(tuan)(tuan)、數(shu)據(ju)系統(tong)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si) 、通(tong)用市場集團(tuan)(tuan) 、網絡(luo)運(yun)營集團(tuan)(tuan)、網絡(luo)系統(tong)集團(tuan)(tuan)、技(ji)術系統(tong)集團(tuan)(tuan)、公(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)國(guo)(guo)際(ji)集團(tuan)(tuan)。主要業(ye)(ye)務(wu)是：為(wei)(wei)國(guo)(guo)內(nei)國(guo)(guo)際(ji)提供(gong)(gong)電(dian)(dian)(dian)(dian)話(hua)服務(wu)。利用海底電(dian)(dian)(dian)(dian)纜、海底光纜、通(tong)信衛星，可聯系250個(ge)國(guo)(guo)家(jia)和(he)地(di)區(qu)，147個(ge)國(guo)(guo)家(jia)和(he)地(di)區(qu)可直(zhi)接撥號。提供(gong)(gong)商業(ye)(ye)機器(qi)、數(shu)據(ju)類(lei)(lei)產(chan)(chan)品(pin)和(he)消費類(lei)(lei)產(chan)(chan)品(pin)。提供(gong)(gong)電(dian)(dian)(dian)(dian)信網絡(luo)系統(tong)。各種服務(wu)及租賃(lin)業(ye)(ye)務(wu)。它還為(wei)(wei)政(zheng)府提供(gong)(gong)產(chan)(chan)品(pin)和(he)服務(wu)。該公(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)非常重視科(ke)研和(he)開發新產(chan)(chan)品(pin)。美國(guo)(guo)電(dian)(dian)(dian)(dian)話(hua)電(dian)(dian)(dian)(dian)報(bao)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)在(zai)泰國(guo)(guo)、德國(guo)(guo)、新加坡等地(di)設(she)有(you)(you)工廠。在(zai)意(yi)大利、韓國(guo)(guo)、日本等國(guo)(guo)設(she)有(you)(you)子公(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)或者合資公(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)。1995年9月，該公(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)解(jie)體為(wei)(wei)三個(ge)獨(du)立的公(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)：通(tong)訊(xun)服務(wu)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)、通(tong)訊(xun)設(she)備公(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)、電(dian)(dian)(dian)(dian)腦(nao)信息服務(wu)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)，并且退(tui)出個(ge)人電(dian)(dian)(dian)(dian)腦(nao)領域。AT&T的瓦解(jie)過程開始于1984年。在(zai)美國(guo)(guo)政(zheng)府反壟斷(duan)政(zheng)策的強制干預下，公(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)的本地(di)電(dian)(dian)(dian)(dian)話(hua)業(ye)(ye)務(wu)被分(fen)裂出去(qu)，重新組建了7個(ge)子公(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)，分(fen)別是：貝(bei)爾太平(ping)洋(yang)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)、Ameritech公(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)、貝(bei)爾西南公(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)、貝(bei)爾西部(bu)美國(guo)(guo)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)、貝(bei)爾大西洋(yang)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)、貝(bei)爾南方公(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)和(he)Nynex公(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)(si)(si)。