AT&T公司(si)(si)（英語(yu)：AT&T Inc.，原為(wei)American Telephone & Telegraph的縮(suo)寫，也是(shi)中(zhong)文譯名美國電(dian)(dian)話電(dian)(dian)報公司(si)(si)由來(lai)，但近(jin)年(nian)來(lai)已不(bu)用全名），是(shi)一家(jia)美國電(dian)(dian)信(xin)公司(si)(si)，創建于1877年(nian)。 AT&T在近(jin)120年(nian)中(zhong)，曾經(jing)過多次分(fen)拆和重組。 AT&T也是(shi)是(shi)美國NBA聯盟圣安東尼奧馬(ma)刺的球館英語(yu)名AT&T Center。

美(mei)國(guo)(guo)電(dian)(dian)話(hua)(hua)電(dian)(dian)報公(gong)(gong)(gong)司(si)(si)(si)有8個(ge)主要部(bu)門 ：貝(bei)爾實(shi)驗室(shi)、商業(ye)(ye)市場集(ji)(ji)團、數據(ju)系(xi)(xi)統公(gong)(gong)(gong)司(si)(si)(si) 、通用(yong)(yong)市場集(ji)(ji)團 、網絡(luo)運(yun)營集(ji)(ji)團、網絡(luo)系(xi)(xi)統集(ji)(ji)團、技術系(xi)(xi)統集(ji)(ji)團、公(gong)(gong)(gong)司(si)(si)(si)國(guo)(guo)際集(ji)(ji)團。主要業(ye)(ye)務是(shi)：為國(guo)(guo)內國(guo)(guo)際提(ti)供(gong)電(dian)(dian)話(hua)(hua)服務。利用(yong)(yong)海底(di)電(dian)(dian)纜、海底(di)光纜、通信衛星(xing)，可聯系(xi)(xi)250個(ge)國(guo)(guo)家(jia)和(he)地區，147個(ge)國(guo)(guo)家(jia)和(he)地區可直接撥號。提(ti)供(gong)商業(ye)(ye)機器、數據(ju)類產(chan)品和(he)消費類產(chan)品。提(ti)供(gong)電(dian)(dian)信網絡(luo)系(xi)(xi)統。各種服務及租(zu)賃業(ye)(ye)務。它還為政府(fu)提(ti)供(gong)產(chan)品和(he)服務。該公(gong)(gong)(gong)司(si)(si)(si)非常重(zhong)視科研(yan)和(he)開發新(xin)產(chan)品。美(mei)國(guo)(guo)電(dian)(dian)話(hua)(hua)電(dian)(dian)報公(gong)(gong)(gong)司(si)(si)(si)在泰(tai)國(guo)(guo)、德國(guo)(guo)、新(xin)加坡等地設有工廠。在意大利、韓(han)國(guo)(guo)、日本(ben)等國(guo)(guo)設有子公(gong)(gong)(gong)司(si)(si)(si)或者合資(zi)公(gong)(gong)(gong)司(si)(si)(si)。1995年9月，該公(gong)(gong)(gong)司(si)(si)(si)解體(ti)為三個(ge)獨立的公(gong)(gong)(gong)司(si)(si)(si)：通訊服務公(gong)(gong)(gong)司(si)(si)(si)、通訊設備公(gong)(gong)(gong)司(si)(si)(si)、電(dian)(dian)腦信息服務公(gong)(gong)(gong)司(si)(si)(si)，并且退出(chu)個(ge)人電(dian)(dian)腦領域。AT&T的瓦解過程(cheng)開始于1984年。在美(mei)國(guo)(guo)政府(fu)反(fan)壟斷(duan)政策的強制干預下，公(gong)(gong)(gong)司(si)(si)(si)的本(ben)地電(dian)(dian)話(hua)(hua)業(ye)(ye)務被分(fen)裂出(chu)去，重(zhong)新(xin)組建了(le)7個(ge)子公(gong)(gong)(gong)司(si)(si)(si)，分(fen)別是(shi)：貝(bei)爾太平洋公(gong)(gong)(gong)司(si)(si)(si)、Ameritech公(gong)(gong)(gong)司(si)(si)(si)、貝(bei)爾西(xi)南(nan)公(gong)(gong)(gong)司(si)(si)(si)、貝(bei)爾西(xi)部(bu)美(mei)國(guo)(guo)公(gong)(gong)(gong)司(si)(si)(si)、貝(bei)爾大西(xi)洋公(gong)(gong)(gong)司(si)(si)(si)、貝(bei)爾南(nan)方公(gong)(gong)(gong)司(si)(si)(si)和(he)Nynex公(gong)(gong)(gong)司(si)(si)(si)。