Dorit Margreiter Choy (* 1967 in Vienna) is a photographer,  video and installation artist.

She studied at the University of Applied Arts, Vienna 1988-1992.

From 1997 to 1998 she participated in the International Studio Program of Künstlerhaus Bethanien, Berlin. In 2001 she was artist in residence at the MAK Center for Art and Architecture/artist in residence, Los Angeles. In 2001 she received the Georg Eisler Prize and in 2002 the Otto Mauer Prize, Vienna.

For her appearance at the 53rd Venice Biennale in 2009, she had a side wing of the Austrian pavilion converted into a cinema and simultaneously used it as a filming location for a silent film shown there (Pavilion, 2009 35mm, b/w, silent, 8min). "I wanted to explore this space, which appears to be a historic garden house but is completely unsuitable as a contemporary exhibition space, as a cinematic and sculptural space. I was particularly interested in the architecture of the pavilion with its spectacular light shows."

Margreiter Choy is the professor for video and video installation at the Academy of Fine Arts, Vienna. She lives and works in Vienna.