Jim Halpert was played by John Krasinski.
James Duncan `` Jim '' Halpert ( born October 1 , 1978 ) is a fictional character in the U.S. version of the television sitcom The Office , portrayed by John Krasinski . John Krasinski . He is widely known for his portrayal as Jim Halpert on the NBC comedy series The Office , for which he received critical acclaim and won numerous awards .