John Burke Krasinski (born October 20, 1979) is an American actor, film director and writer. He has acted in several films, including Shrek the Third, Leatherheads and Away We Go, but is most widely known for playing Jim Halpert on the NBC sitcom The Office.

Krasinski was born in the Brighton area of Boston, Massachusetts, the son of a Polish-American father, internist Dr. Ronald Krasinski, and an Irish American mother, Mary Clare (née Doyle). He has two older brothers, Kevin and Paul, and was raised Roman Catholic in the suburb of Newton, Massachusetts.

He attended the same high school as B. J. Novak, who would later become Krasinski's co-star on The Office, as well as a writer and co-producer of the series. Krasinski also performed in a play written by Novak. Krasinski graduated from Newton South High School in 1997.