Quentin Bajac (born 1965) is a French museum curator and art historian specialising in the history of photography. He is the director of the Galerie nationale du Jeu de Paume in Paris.
Bajac has held positions at the Musée d'Orsay (1995–2003), Centre Georges Pompidou (2003–2010), Musée National d'Art Moderne and École du Louvre (2010–2013) and Museum of Modern Art (MoMA) (2013–2018).
He has published a number of works on photography, most notably the three-volume series—La photographie—on the history of photography (2000–2010), which belongs to the collection Découvertes Gallimard, as well as Parr by Parr: Discussions with a Promiscuous Photographer (2011), Stephen Shore: Solving Pictures (2017), Being Modern: MoMA in Paris (co-author with Olivier Michelon, 2017).
In 2013 Bajac was made a Chevalier (knight) of the Ordre des Arts et des Lettres.