AT&T公司(si)（英(ying)語：AT&T Inc.，原為American Telephone & Telegraph的(de)縮寫，也是(shi)中文(wen)譯名(ming)(ming)(ming)美國(guo)電話電報公司(si)由來(lai)，但近年來(lai)已不用全(quan)名(ming)(ming)(ming)），是(shi)一家美國(guo)電信公司(si)，創建于1877年。 AT&T在近120年中，曾(ceng)經過多次分拆和重組。 AT&T也是(shi)是(shi)美國(guo)NBA聯(lian)盟圣安東尼奧馬(ma)刺的(de)球館英(ying)語名(ming)(ming)(ming)AT&T Center。

美國(guo)電(dian)話(hua)電(dian)報(bao)(bao)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)有(you)8個(ge)主要部(bu)門(men) ：貝(bei)爾(er)(er)(er)(er)實驗(yan)室、商業(ye)市場集(ji)團(tuan)、數據(ju)系統(tong)(tong)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si) 、通(tong)用(yong)市場集(ji)團(tuan) 、網(wang)絡運營集(ji)團(tuan)、網(wang)絡系統(tong)(tong)集(ji)團(tuan)、技(ji)術系統(tong)(tong)集(ji)團(tuan)、公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)國(guo)際(ji)集(ji)團(tuan)。主要業(ye)務(wu)是：為(wei)國(guo)內國(guo)際(ji)提(ti)供電(dian)話(hua)服(fu)務(wu)。利(li)用(yong)海底電(dian)纜、海底光纜、通(tong)信(xin)衛星，可(ke)聯系250個(ge)國(guo)家和(he)(he)地(di)區(qu)，147個(ge)國(guo)家和(he)(he)地(di)區(qu)可(ke)直(zhi)接撥(bo)號。提(ti)供商業(ye)機(ji)器、數據(ju)類產品和(he)(he)消(xiao)費類產品。提(ti)供電(dian)信(xin)網(wang)絡系統(tong)(tong)。各種服(fu)務(wu)及租(zu)賃(lin)業(ye)務(wu)。它還為(wei)政(zheng)(zheng)府(fu)提(ti)供產品和(he)(he)服(fu)務(wu)。該公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)非(fei)常重(zhong)視(shi)科研和(he)(he)開發新產品。美國(guo)電(dian)話(hua)電(dian)報(bao)(bao)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)在泰國(guo)、德國(guo)、新加(jia)坡等地(di)設有(you)工廠。在意(yi)大(da)(da)利(li)、韓國(guo)、日本等國(guo)設有(you)子(zi)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)或者合資公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)。1995年9月(yue)，該公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)解體為(wei)三個(ge)獨(du)立的(de)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)：通(tong)訊服(fu)務(wu)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)、通(tong)訊設備(bei)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)、電(dian)腦信(xin)息(xi)服(fu)務(wu)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)，并且退出個(ge)人電(dian)腦領域。AT&T的(de)瓦解過(guo)程開始于1984年。在美國(guo)政(zheng)(zheng)府(fu)反壟斷政(zheng)(zheng)策的(de)強制干預下(xia)，公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)的(de)本地(di)電(dian)話(hua)業(ye)務(wu)被(bei)分裂出去(qu)，重(zhong)新組建了7個(ge)子(zi)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)，分別是：貝(bei)爾(er)(er)(er)(er)太平洋(yang)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)、Ameritech公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)、貝(bei)爾(er)(er)(er)(er)西(xi)(xi)南(nan)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)、貝(bei)爾(er)(er)(er)(er)西(xi)(xi)部(bu)美國(guo)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)、貝(bei)爾(er)(er)(er)(er)大(da)(da)西(xi)(xi)洋(yang)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)、貝(bei)爾(er)(er)(er)(er)南(nan)方(fang)公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)和(he)(he)Nynex公(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)。