Mark Boal (born January 23, 1973) is an American journalist, screenwriter, and film producer. Boal initially worked as a journalist, writing for outlets like Rolling Stone, The Village Voice, Salon, and Playboy. Boal's 2004 article "Death and Dishonor" was adapted for the film In the Valley of Elah, which Boal also co-wrote.

In 2008, he wrote and produced The Hurt Locker, for which he won both the Academy Award for Best Original Screenplay and the Academy Award for Best Picture. In 2012 he wrote and produced Zero Dark Thirty, teaming again with director Kathryn Bigelow, about the tracking and killing of Osama bin Laden. The film earned him Academy Award nominations for Best Original Screenplay and Best Picture and a Writers Guild of America Award for Best Original Screenplay. The pair collaborated a third time for 2017's Detroit.

Boal has won two Academy Awards (with another two nominations), a BAFTA Award, two Writers Guild of America Awards, and a Producers Guild of America Award, and also has four Golden Globe Award nominations.

Mark Boal was born on January 23, 1973, in New York City, the son of Lillian Firestone and William Stetson Boal, Jr., a producer of educational films. His half–brother is Christopher Stetson Boal, a playwright and screenwriter. His mother was born to a Jewish family and his father converted to Judaism. Boal attended Bronx High School of Science and was on the high school's Speech and Debate Team. He earned his undergraduate degree in Philosophy from Oberlin College in 1995.

Boal has worked as a freelance journalist and screenwriter. He has contributed articles to such magazines as The Village Voice, Salon, Rolling Stone and Playboy.

Boal's 2004 article "Death and Dishonor", about the 2003 murder of veteran Richard T. Davis after his return to the United States, was published in Playboy magazine. It inspired writer/director Paul Haggis, who adapted it for his fictional screenplay as the film In the Valley of Elah, which he also directed. Boal and Haggis have writing credit for the story.

As a journalist, Boal was embedded with troops and bomb squads in 2004 during the Iraq War. He wrote an article about one of the bomb experts, Sergeant Jeffrey S. Sarver, in an article entitled, "The Man in the Bomb Suit", published in September 2005 in Playboy magazine.

Boal went on to write an original screenplay, titled The Hurt Locker, about a fictional set of characters and events based on his interviews and observations in Iraq. He was also a producer for the 2009 film adaptation set in Iraq, about a U.S. Army Explosive Ordnance Disposal (EOD) bomb squad. The film was directed by Kathryn Bigelow, his business partner and co-producer.