Matthew Kazuo Firpo is an American film director, screenwriter, and photographer. Along with his cousin, Ryan, he wrote the story for the Marvel Cinematic Universe film Eternals. His debut documentary, Refuge, won Best Documentary at the Santa Barbara International Film Festival and had its world premiere at SXSW.

He graduated in 2012 from the New York University Tisch School of the Arts undergraduate program. At the age of 25, Firpo was named one of  Forbes' 30 Under 30 in 2016. His debut screenplay Ruintopped Hollywood's 2017 Black List. Until 2020, he was known professionally as Matt Firpo; he changed his public name to Kaz Firpo (based on his middle name) before the release of Eternals.