{{韓国の事物|
title=KT|
hangeul=케이티|
hanja=-|
katakana=ケイティ|
alphabet-type=英語|
alphabet=KT|
}}
'''KT'''（ケイティー）は大韓民国最大の通信事業者。本社はソウル特別市の南方に位置する京畿道城南市にある。

前身は国営企業'''韓国通信'''。Korea Telecom"の名称が用いられることがあるが、正式名称は"KT"である。韓国取引所(旧韓国証券取引所、証券コード:32000)、ニューヨーク証券取引所(証券コード:KTC)に株式を上場している。

韓国内で「KTH」や「MegaPass」ブランドでのブロードバンド事業や子会社KTFの携帯電話事業、「Paran」ブランドでのインターネットポータル事業、「Nespot」ブランドでの公衆無線LAN事業などを手がける。

固定電話事業及びインターネットサービスプロバイダ事業ではハナロ通信やLG DACOMが、携帯電話事業ではDaumやNAVER、Yahoo!などが競争相手であり、KTは多様な分野で競争力を持つガリバー企業と言える。これら企業による通信分野における熾烈な競争は、同国のIT水準を高めているといわれる。

2002 FIFAワールドカップの公式スポンサーであり、大韓サッカー協会のスポンサーでもある。

プロ野球界に参入する予定だったが、新規参入金や本拠地などをめぐる問題が解決せず白紙撤回となった。

{{Infobox_Company
| company_name   = KT
| company_logo   = 172px<br />172px
| company_type   = Private
| company_slogan = ''"Life is Wonderfull, KT"''
| foundation     = 1981 (privatized since 2002)
| location       =  Seongnam, South Korea
| key_people     = Nam Joong-soo, CEO
| revenue        =  ₩118,773 billion (2005)
| num_employees  = around 37,500 (March 2007)
| products       = Fixed telephone<br />Mobile telephone<br />Broadband, Internet services<br />IT/Network services
| homepage       = [http://www.kt.com www.kt.com]
}}
'''KT''' (formerly, Korea Telecom, Korean: 한국통신, ) is a prominent South Korea's integrated wired/wireless  telecommunication service provider. KT has developed an information & communications business for the last 25 years after privatization, and has the largest portion of the South Korean local telephone and high-speed Internet business. <BR>
Among its products is the wireless broadband service(WIBRO).

* Global Businesses
KT is a prominent world-wide broadband operator. 
 
* Domestic Businesses
KT offers a range of products and services for domestic customers, including telephone service, 
broadband Internet service, internet access, LM service, wireless service and data service.

*Annual Reports
The [http://www.kt.co.kr/eng/Inv/finance_annual.jsp?pageNum=3 2005 Annual Report] is available online.
 
==KT History==
On August 20, 1885, The Hansung Telegraphy Ministry was established as the first Telecom Authority in Korea, and on December 10, 1981, Korea Telecom Authority was founded.

;<nowiki>1982—1991: Starting PC communication service, HiTEL</nowiki>
*January 1, 1983: First installation of Korean-made DDD-type public telephones
*August 1, 1983: International Subscriber Dialing (ISD) service started
*April 25, 1984: TDX-1, fully digitized telephone switching system, developed
*July 25, 1984: Packet-exchange air data network opened
*October 29, 1984: Kwanghwamun Telecommunication Center, the previous headquarters of KT, completed
*September 28, 1985: Centennial of telecommunications celebrated
*March 1, 1986: Tone & display mode paging service commenced
*March 14, 1986: TDX-1 put into operation
*September 30, 1987: Telephone switching capacity exceeded 10 million lines
*July 10, 1990: Submarine optical cable system completed
*September 9, 1991: HiTEL service, Korea’s leading PC communication service, started
*December 3, 1991: Competition introduced in the 001 (international call) market 

;<nowiki>1992—1997: Launched Koreasat 1, Korea’s first satellite</nowiki>
*September 25, 1992: Trial domestic satellite service started
*December 29, 1993: ISDN commercial service commenced
*March 10, 1994: Fire in underground communications cable tunnel
*June 20, 1994: Commercial Internet service, KORNET, introduced
*August 5, 1995: Koreasat 1, Korea’s first satellite, launched
*January 1, 1996: Competition introduced in the long distance call market
*January 14, 1996: Koreasat 2 launched
*May 7, 1997: Telephone subscriptions exceeded 20 million
*October 1, 1997: KT become a joint share company
*November 6, 1997: Telephone lines connected to TDX system exceed 10 million
*December 9, 1997: KT elected Lee Kye-Cheol as a president, keeping with the private company system

;<nowiki>1998—2001: Listing KT shares on the Korea Stock Exchange</nowiki>
*September 11, 1998: The headquarters of KT was moved from Kwanghwamun to Bundang
*December 23, 1998: KT shares listed on the Korea Stock Exchange
*May 26, 1999: KT depository receipts (DR) listed on foreign stock exchanges
*June 1, 1999: Commercialization of High-speed Internet, ADSL
*September 5, 1999: Successful launching of the Moogoonghwa 3 satellite
*October 27, 1999: Proclamation of the vision for the New Millennium; Leader of the Cyberworld
*May 16, 2000: Launch of Asia’s Largest Korea Telecom-Internet Data Center(KT-IDC)
*June 15, 2000: Completion of contract to acquire Hansol M.com
*July 2, 2000: Integration of regional codes for inter-city calls
*August 14, 2000: Successfully connecting the first-ever optical communications network between South and North Korea (Seoul-Panmunjum-Pyeongyang)
*October 25, 2000: Designation as official partner for information telecommunications area of the 2002 World Cup
*December 15, 2000: Winning a licese for IMT-2000
*December 19, 2000: Acquisition of a license for satellite television broadcasting services (Korea Digital Satellite Broadcasting)
*May 2, 2001: The birth of Korea’s mobile communications company KTF
*June 29, 2001: The second issuance of overseas depository receipts
*December 11, 2001: Change of company name and declaration of new CI
*December 22, 2001: Strategic Partnership Agreement with Microsoft, USA

;<nowiki>2002—2007: Declaring KT as a fully privatized company</nowiki>
*May 31, 2002: Successful telecommunications support for “2002 FIFA World Cup Korea/Japan”
*August 20, 2002: KT declared a fully privatized company
*April 3, 2003: Introduction of Quality Innovation Program, ‘Six Sigma’
*May 6, 2003: KT selected as top company in corporate governance excellence for Asia
*June 4, 2003:  Smart Card “1’ts” Service Launched
*September 1, 2003: KT opens the first ADSL in Vietnam
*October 17, 2003: KT decides to destroy 6 million shares of its own stock
*November 10, 2004: launched Ann, KT’s new fixed line phone service with a variety of value-added features including SMS
*January 10, 2005: KT launches the World’s First WDM-PON-based FTTH service
*January 20, 2005: KT leading the mobile Internet market
*March 13, 2005:  Successful Testing Korea’s first wireless network IPv6
*March 29, 2005: Ranked top in the NCSI (National Customer Satisfaction Index) in all Areas of Fixed Communication
*June 23, 2005: The best company in corporate governance for Four Consecutive Years
*October 6, 2005: A new corporate Slogan for Wonder Management: “Life is Wonderful”
*December 20, 2005: Modernization of Bangladeshi Communication Network
*December 28, 2005: Opening of the North-South Korea Communication Center in Gaeseong Industrial Complex and Gaeseng Branch
*April 11, 2006: KT ranked top in the NCSI in Four Areas