BT Global Services is a division of United Kingdom Telecommunications operator BT Group. It delivers a combination of communications and IT services to over 10,000 organisations and governments worldwide. Its customers include over 25% of the global Fortune 500 and it is the largest supplier of networked IT services to UK government. BT Global Services employs around 22,000 people globally, with one of the largest professional services capabilities in its industry. Total income for BT Global Services in 2010-2011 was £8.047bn. The company offers networked IT services over its global 21st century network (21CN) to customers in more than 190 countries. BT's global capabilities include MPLS service in 197 countries, satellite services in 112 countries, telehousing facilities in 9 countries, 7 global development centres in 4 countries, 19 global service centres in 12 countries and 9 security operation centres in 5 countries.

BT has been serving global organisations since 1984. During the 1990s, between the loosening of national telecom monopolies and the current (largely) liberalised market, BT entered into a number of alliances in order to serve its mainly, then, UK-based multi-national customers. In 2002 the final attempt at such an alliance (Concert 2 with AT&T) was disbanded. Thereafter the company brought together a number of joint ventures, partly owned assets and wholly owned subsidiaries into the single entity that exists today.