XX/XY is a 2002 American romantic drama film starring Mark Ruffalo, Kathleen Robertson, and Maya Stange. The film is a romantic drama written and directed by Austin Chick, the title referring to the different chromosome pairings present in men and women. It was nominated for the Grand Jury Prize at the Sundance Film Festival in the year it was released. Although the funding for the film came from the US, the film was produced by British company Natural Nylon.