Prix Iris for Best Costume Design

The Prix Iris for Best Costume Design (Prix Iris des meilleurs costumes) is an annual film award, presented by Québec Cinéma as part of its Prix Iris awards program, to honour the year's best costume design in films made within the Cinema of Quebec.

The award was presented for the first time at the 6th Jutra Awards in 2004.

Until 2016, it was known as the Jutra Award for Best Costume Design in memory of influential Quebec film director Claude Jutra. Following the withdrawal of Jutra's name from the award, the 2016 award was presented under the name Québec Cinéma. The Prix Iris name was announced in October 2016.

Ginette Magny received the most nominations, ten, and won one award. She was the first costume designer to receive two nominations in the same year in 2006, a feat that would be repeated by Michèle Hamel in 2009, Patricia McNeil in 2020 and Sophie Lefebvre in 2023.

Carmen Alie and Francesca Chamberland each won three awards, including two consecutive wins each: in 2013 and 2014 for Alie and in 2021 and 2022 for Chamberland.

Xavier Dolan is the only costume designer to receive a nomination for a film he also directed with Mommy.