AT&T公(gong)司（英語：AT&T Inc.，原(yuan)為(wei)American Telephone & Telegraph的(de)縮(suo)寫，也是(shi)中(zhong)文(wen)譯名美國電(dian)(dian)話電(dian)(dian)報公(gong)司由來(lai)，但近(jin)年(nian)來(lai)已不用(yong)全名），是(shi)一家美國電(dian)(dian)信公(gong)司，創(chuang)建于1877年(nian)。 AT&T在近(jin)120年(nian)中(zhong)，曾(ceng)經過多次分拆(chai)和重(zhong)組。 AT&T也是(shi)是(shi)美國NBA聯盟圣安(an)東尼奧馬刺(ci)的(de)球(qiu)館英語名AT&T Center。

美(mei)(mei)國(guo)(guo)(guo)電(dian)話(hua)電(dian)報公(gong)(gong)(gong)司(si)(si)(si)有8個(ge)主要(yao)部門 ：貝(bei)爾(er)(er)實驗室、商(shang)業(ye)(ye)市(shi)場集(ji)(ji)團、數(shu)據系(xi)(xi)統公(gong)(gong)(gong)司(si)(si)(si) 、通(tong)用市(shi)場集(ji)(ji)團 、網(wang)絡(luo)運(yun)營集(ji)(ji)團、網(wang)絡(luo)系(xi)(xi)統集(ji)(ji)團、技術(shu)系(xi)(xi)統集(ji)(ji)團、公(gong)(gong)(gong)司(si)(si)(si)國(guo)(guo)(guo)際集(ji)(ji)團。主要(yao)業(ye)(ye)務(wu)是：為(wei)(wei)國(guo)(guo)(guo)內國(guo)(guo)(guo)際提(ti)供(gong)電(dian)話(hua)服(fu)(fu)(fu)務(wu)。利用海(hai)底電(dian)纜(lan)、海(hai)底光纜(lan)、通(tong)信(xin)衛星，可聯(lian)系(xi)(xi)250個(ge)國(guo)(guo)(guo)家(jia)和地區(qu)，147個(ge)國(guo)(guo)(guo)家(jia)和地區(qu)可直接撥號。提(ti)供(gong)商(shang)業(ye)(ye)機器、數(shu)據類(lei)產(chan)品(pin)(pin)和消(xiao)費(fei)類(lei)產(chan)品(pin)(pin)。提(ti)供(gong)電(dian)信(xin)網(wang)絡(luo)系(xi)(xi)統。各種服(fu)(fu)(fu)務(wu)及租(zu)賃業(ye)(ye)務(wu)。它還為(wei)(wei)政(zheng)府提(ti)供(gong)產(chan)品(pin)(pin)和服(fu)(fu)(fu)務(wu)。該(gai)公(gong)(gong)(gong)司(si)(si)(si)非常重視(shi)科研和開(kai)發新(xin)產(chan)品(pin)(pin)。美(mei)(mei)國(guo)(guo)(guo)電(dian)話(hua)電(dian)報公(gong)(gong)(gong)司(si)(si)(si)在(zai)泰國(guo)(guo)(guo)、德國(guo)(guo)(guo)、新(xin)加坡(po)等(deng)(deng)地設(she)(she)有工廠。在(zai)意大利、韓國(guo)(guo)(guo)、日本等(deng)(deng)國(guo)(guo)(guo)設(she)(she)有子公(gong)(gong)(gong)司(si)(si)(si)或者合(he)資公(gong)(gong)(gong)司(si)(si)(si)。1995年(nian)9月，該(gai)公(gong)(gong)(gong)司(si)(si)(si)解體為(wei)(wei)三個(ge)獨立的公(gong)(gong)(gong)司(si)(si)(si)：通(tong)訊(xun)服(fu)(fu)(fu)務(wu)公(gong)(gong)(gong)司(si)(si)(si)、通(tong)訊(xun)設(she)(she)備公(gong)(gong)(gong)司(si)(si)(si)、電(dian)腦信(xin)息服(fu)(fu)(fu)務(wu)公(gong)(gong)(gong)司(si)(si)(si)，并且(qie)退出個(ge)人(ren)電(dian)腦領域(yu)。AT&T的瓦解過程開(kai)始于(yu)1984年(nian)。在(zai)美(mei)(mei)國(guo)(guo)(guo)政(zheng)府反(fan)壟斷政(zheng)策的強制(zhi)干預下，公(gong)(gong)(gong)司(si)(si)(si)的本地電(dian)話(hua)業(ye)(ye)務(wu)被(bei)分裂出去，重新(xin)組(zu)建了7個(ge)子公(gong)(gong)(gong)司(si)(si)(si)，分別是：貝(bei)爾(er)(er)太平洋公(gong)(gong)(gong)司(si)(si)(si)、Ameritech公(gong)(gong)(gong)司(si)(si)(si)、貝(bei)爾(er)(er)西南公(gong)(gong)(gong)司(si)(si)(si)、貝(bei)爾(er)(er)西部美(mei)(mei)國(guo)(guo)(guo)公(gong)(gong)(gong)司(si)(si)(si)、貝(bei)爾(er)(er)大西洋公(gong)(gong)(gong)司(si)(si)(si)、貝(bei)爾(er)(er)南方公(gong)(gong)(gong)司(si)(si)(si)和Nynex公(gong)(gong)(gong)司(si)(si)(si)。