Mattie Do (b. 1981, California, USA) is a Laotian American film director. She is Lao’s first and only female film director. Her debut film, Chantaly (2012), was the first Lao film to screen outside of Southeast Asia — a success that led to her being selected for the Cannes’ Fabrique des Cinémas du Monde, TIFF’s Directors Talent Lab, and Berlinale Talents. Her second film, Dearest Sister (2016), was Laos’ first entry for the Foreign Language Award at the 90th Academy Awards. In 2019, her latest film, The Long Walk (2019), premiered in the Giornate degli Autori section of the Venice Film Festival, and received the Best Director award at the Sitges - Catalonian International Film Festival.

Mattie produced Laos’ first American and Japanese co-productions, after aiding the Lao government in creating the needed infrastructure for these foreign co-productions. Born to Lao refugees, she was raised in Los Angeles but returned to Laos a decade ago.