GMR owns Delhi Daredevils and Shah Rukh Khan is co-owner of Kolkata Knight Riders in the hugely popular Indian Premier League.
GMR's team will be based in Johannesburg with young Protea paceman Kagiso Rabada as its marquee player while Khan's outfit will be based in Cape Town with left-handed batsman JP Duminy as the marquee player.
"EY (previously known as Ernst & Young) ran the team owner selection process to ensure integrity, compliance and due diligence was followed throughout the process by both CSA and potential owners," a release said.
"The announcement of the team owners is a key milestone to successfully launch our T20 Global League. We are thrilled by the international mix of owners and the passion and excitement that was clearly demonstrated during the bidding process by them and the marquee players. It sets up our #T20GL as a fans favourite in the cricketing calendar," CSA Chief Executive Haroon Lorgat said.