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AT&T公(gong)司（英語：AT&T Inc.，原為American Telephone & Telegraph的縮寫，也是(shi)中(zhong)(zhong)文譯名美國電(dian)話電(dian)報公(gong)司由(you)來，但(dan)近年(nian)(nian)來已(yi)不(bu)用全名），是(shi)一家美國電(dian)信公(gong)司，創建于1877年(nian)(nian)。 AT&T在近120年(nian)(nian)中(zhong)(zhong)，曾經過多次分拆和重組。 AT&T也是(shi)是(shi)美國NBA聯盟圣(sheng)安東尼奧馬刺的球(qiu)館英語名AT&T Center。

美(mei)國(guo)(guo)(guo)(guo)電(dian)(dian)(dian)話(hua)電(dian)(dian)(dian)報公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)有8個(ge)(ge)(ge)主要部(bu)門 ：貝(bei)(bei)爾(er)實驗(yan)室、商業(ye)(ye)市(shi)場(chang)集團(tuan)、數據系統(tong)(tong)公(gong)(gong)(gong)(gong)司(si)(si)(si)(si) 、通(tong)用市(shi)場(chang)集團(tuan) 、網絡運營(ying)集團(tuan)、網絡系統(tong)(tong)集團(tuan)、技術(shu)系統(tong)(tong)集團(tuan)、公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)國(guo)(guo)(guo)(guo)際(ji)集團(tuan)。主要業(ye)(ye)務(wu)(wu)是：為(wei)(wei)國(guo)(guo)(guo)(guo)內國(guo)(guo)(guo)(guo)際(ji)提(ti)供(gong)電(dian)(dian)(dian)話(hua)服務(wu)(wu)。利用海底電(dian)(dian)(dian)纜、海底光(guang)纜、通(tong)信衛(wei)星，可聯(lian)系250個(ge)(ge)(ge)國(guo)(guo)(guo)(guo)家和地區，147個(ge)(ge)(ge)國(guo)(guo)(guo)(guo)家和地區可直接撥號。提(ti)供(gong)商業(ye)(ye)機(ji)器、數據類產(chan)(chan)品(pin)和消費類產(chan)(chan)品(pin)。提(ti)供(gong)電(dian)(dian)(dian)信網絡系統(tong)(tong)。各種服務(wu)(wu)及(ji)租賃業(ye)(ye)務(wu)(wu)。它還(huan)為(wei)(wei)政府(fu)提(ti)供(gong)產(chan)(chan)品(pin)和服務(wu)(wu)。該(gai)公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)非(fei)常(chang)重(zhong)視(shi)科研和開發新產(chan)(chan)品(pin)。美(mei)國(guo)(guo)(guo)(guo)電(dian)(dian)(dian)話(hua)電(dian)(dian)(dian)報公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)在(zai)泰(tai)國(guo)(guo)(guo)(guo)、德(de)國(guo)(guo)(guo)(guo)、新加坡(po)等(deng)地設(she)有工(gong)廠(chang)。在(zai)意大利、韓國(guo)(guo)(guo)(guo)、日本等(deng)國(guo)(guo)(guo)(guo)設(she)有子(zi)公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)或者合資公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)。1995年9月，該(gai)公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)解(jie)體為(wei)(wei)三個(ge)(ge)(ge)獨(du)立的公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)：通(tong)訊服務(wu)(wu)公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)、通(tong)訊設(she)備公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)、電(dian)(dian)(dian)腦信息服務(wu)(wu)公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)，并且退出個(ge)(ge)(ge)人(ren)電(dian)(dian)(dian)腦領域。AT&T的瓦解(jie)過程開始于1984年。在(zai)美(mei)國(guo)(guo)(guo)(guo)政府(fu)反壟斷政策的強制(zhi)干預下，公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)的本地電(dian)(dian)(dian)話(hua)業(ye)(ye)務(wu)(wu)被(bei)分(fen)裂出去，重(zhong)新組建(jian)了7個(ge)(ge)(ge)子(zi)公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)，分(fen)別是：貝(bei)(bei)爾(er)太平洋公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)、Ameritech公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)、貝(bei)(bei)爾(er)西南(nan)公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)、貝(bei)(bei)爾(er)西部(bu)美(mei)國(guo)(guo)(guo)(guo)公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)、貝(bei)(bei)爾(er)大西洋公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)、貝(bei)(bei)爾(er)南(nan)方公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)和Nynex公(gong)(gong)(gong)(gong)司(si)(si)(si)(si)。