The 45-year-old composer, who has already won two Oscars for his music in 'Slumdog Millionaire' and two Grammy under his belt, has won the laurel for the Danny Boyle directed film, reported Ace Showbiz.
"Thanks to my fans and the World Soundtrack Academy for the Public Choice award for the score of 127 Hours," Rahman posted on Facebook.
Alexandre Desplat, who scored music for films 'The King's Speech' and 'Harry Potter and the Deathly Hallows', bagged the film composer of the year award at the ceremony.
Oscar-winning German composer Hans Zimmer beat out Desplat for the Best Original Film Score honor, taking the prize for his work on Christopher Nolan's 'Inception'.
Veteran songsmith Randy Newman nabbed the Academy's Best Original Song prize for his
tune 'We Belong Together', written for 'Toy Story 3'.
Other winners at the 2011 World Soundtrack Awards, which closed the Ghent International Film Festival this weekend, included Alex Heffes, who won Discovery of the Year for his scores to 'The First Grader and The Rite'; and the Best Young European Composer honor, which went to 'Gabriel Heinrich'.
This year's lifetime achievement award was presented to three-time Oscar winning Italian composer Giorgio Moroder, whose credits include songs for 'Scarface', 'Flashdance' and 'Top Gun'.
