McIlroy set a new record when he reached 16 under par during the tournament, the lowest under par score in US Open history. He also led from start to finish, the first competitor to do so since Tiger Woods in 2000.
Gerald Lawless, executive chairman of the Dubai-based luxury hotel group, described the 22-year-old golfer as an inspiration.
"Since his win at Quail Hollow in the US last year and indeed his victory in the Dubai Desert Classic in 2009, he has continued to impress and inspire golf enthusiasts around the world and we are immensely proud that he carries the Jumeirah brand," he said.
The Jumeirah Group has sponsored McIlroy since he turned professional in 2007. His talent was spotted in his home town of Holywood, Northern Ireland, also home to the group's chief financial officer Alaister Murray.
McIlroy's sponsorship deal was extended in 2010 for a further three years.
By Janie Stamford
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