Cristian Mungiu (Romanian: [kristiˈan munˈd͡ʒi.u]; born 27 April 1968; Iași) is a Romanian filmmaker, screenwriter and producer. He won the Palme d'Or at the 2007 Cannes Film Festival for his film "4 Months, 3 Weeks and 2 Days", which he wrote and directed. He has also won the awards for Best Screenplay and Best Director, at the 2012 and 2016 Cannes Film Festivals, for his films "Beyond the Hills" and "Graduation".

After studying English literature at the University of Iaşi, he worked for a few years as a teacher and as a journalist. After that, he enrolled at the University of Film in Bucharest to study film directing. After graduating in 1998, Mungiu made several short films. In 2002, he debuted with his first feature film, Occident. Occident enjoyed critical success, winning prizes in several film festivals and being featured in Director’s Fortnight at the 2002 Cannes Film Festival.

In 2007 Mungiu wrote and directed his second feature, 4 Months, 3 Weeks and 2 Days. The film was received enthusiastically, attracting critical praise and being selected in the official competition at the 2007 Cannes Film Festival, where it eventually won the coveted Palme d'Or for feature film, marking the first time that prize was awarded to a Romanian filmmaker.

Mungiu has said that early Miloš Forman and Robert Altman are important filmmakers who influenced him. He also respects the realism of Bicycle Thieves, among other famous realistic films. Mungiu is the brother of political analyst Alina Mungiu-Pippidi.