Mark Daniel Bailey (born November 21, 1968) is an American writer, best known for his documentary films, including Last Days in Vietnam (2014), Downfall: The Case Against Boeing (2022), and The Volcano: Rescue from Whakaari (2022).

In 1999, Bailey wrote the film American Hollow, about "the complex ties that bind [an] Appalachian family to a cycle of deprivation,"[4] which was nominated for an Independent Spirit Award and a Primetime Emmy for best documentary.

[5] In 2003, he wrote Pandemic: Facing AIDS, a "five-part documentary series about the lives of people dealing with the disease in various parts of the world.

[8] Subsequently, Bailey was one of the producers of Torte Bluma, a 2005 dramatic short film starring Stellan Skarsgård and Simon McBurney.

[13] In 2011, Bailey was hired by Marvel Studios to write the script for Black Panther, a narrative feature film based on the African comic-book character of the same name.

[32] In 2019, it was announced that Bailey would produce and write the film Adrift,[33][34] which compares the story of the 1939 voyage of the German ocean liner St. Louis to the plight of international refugees today.

[40] Hemingway & Bailey's Bartending Guide to Great American Writers (2006) "brings together classic cocktail recipes, literary history, and .

"[41] Tiny Pie (2013), which Bailey coauthored with Michael Oatman, is a picture book for children ages three to six to which Alice Waters contributed a recipe.

[42] In addition to his collaborations with Hemingway, Bailey conducted interviews that appeared in the 1999 book American Hollow, based on the documentary of the same name.

[49] On August 2, 1999, Bailey married Rory Kennedy, the eleventh and youngest child of former United States senator and attorney general Robert F.