AT&T公司(si)(si)（英語：AT&T Inc.，原為American Telephone & Telegraph的縮寫(xie)，也是中文譯名美(mei)國電話電報公司(si)(si)由來，但近(jin)年來已不用全名），是一家美(mei)國電信公司(si)(si)，創建于1877年。 AT&T在近(jin)120年中，曾經過多次分拆和重(zhong)組。 AT&T也是是美(mei)國NBA聯盟圣安東尼(ni)奧(ao)馬刺的球館英語名AT&T Center。

美國(guo)(guo)(guo)(guo)電(dian)(dian)話電(dian)(dian)報(bao)公(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)有8個主(zhu)要部(bu)門 ：貝(bei)爾(er)實驗室、商業(ye)市(shi)場(chang)集(ji)團(tuan)(tuan)、數據(ju)系統公(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si) 、通(tong)用市(shi)場(chang)集(ji)團(tuan)(tuan) 、網(wang)絡運營集(ji)團(tuan)(tuan)、網(wang)絡系統集(ji)團(tuan)(tuan)、技術(shu)系統集(ji)團(tuan)(tuan)、公(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)國(guo)(guo)(guo)(guo)際(ji)集(ji)團(tuan)(tuan)。主(zhu)要業(ye)務(wu)(wu)(wu)是：為(wei)國(guo)(guo)(guo)(guo)內國(guo)(guo)(guo)(guo)際(ji)提供(gong)電(dian)(dian)話服(fu)(fu)務(wu)(wu)(wu)。利用海底電(dian)(dian)纜(lan)、海底光(guang)纜(lan)、通(tong)信(xin)(xin)衛星(xing)，可聯系250個國(guo)(guo)(guo)(guo)家(jia)和(he)(he)(he)地(di)區，147個國(guo)(guo)(guo)(guo)家(jia)和(he)(he)(he)地(di)區可直接撥號(hao)。提供(gong)商業(ye)機器(qi)、數據(ju)類產品(pin)和(he)(he)(he)消費類產品(pin)。提供(gong)電(dian)(dian)信(xin)(xin)網(wang)絡系統。各種(zhong)服(fu)(fu)務(wu)(wu)(wu)及租賃業(ye)務(wu)(wu)(wu)。它還(huan)為(wei)政府提供(gong)產品(pin)和(he)(he)(he)服(fu)(fu)務(wu)(wu)(wu)。該公(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)非(fei)常重視科研和(he)(he)(he)開(kai)發新(xin)產品(pin)。美國(guo)(guo)(guo)(guo)電(dian)(dian)話電(dian)(dian)報(bao)公(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)在(zai)泰國(guo)(guo)(guo)(guo)、德國(guo)(guo)(guo)(guo)、新(xin)加坡等地(di)設有工廠。在(zai)意大利、韓國(guo)(guo)(guo)(guo)、日本(ben)等國(guo)(guo)(guo)(guo)設有子公(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)或者合資公(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)。1995年9月，該公(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)解(jie)體為(wei)三個獨立(li)的公(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)：通(tong)訊(xun)服(fu)(fu)務(wu)(wu)(wu)公(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)、通(tong)訊(xun)設備公(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)、電(dian)(dian)腦信(xin)(xin)息服(fu)(fu)務(wu)(wu)(wu)公(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)，并且退出(chu)個人(ren)電(dian)(dian)腦領域。AT&T的瓦解(jie)過(guo)程開(kai)始于1984年。在(zai)美國(guo)(guo)(guo)(guo)政府反壟(long)斷政策的強制(zhi)干預下，公(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)的本(ben)地(di)電(dian)(dian)話業(ye)務(wu)(wu)(wu)被分裂出(chu)去，重新(xin)組建了7個子公(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)，分別是：貝(bei)爾(er)太平洋公(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)、Ameritech公(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)、貝(bei)爾(er)西(xi)南公(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)、貝(bei)爾(er)西(xi)部(bu)美國(guo)(guo)(guo)(guo)公(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)、貝(bei)爾(er)大西(xi)洋公(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)、貝(bei)爾(er)南方公(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)和(he)(he)(he)Nynex公(gong)(gong)(gong)(gong)(gong)司(si)(si)(si)(si)。