xxxHolic: A Midsummer Night's Dream (劇場版 xxxHOLiC 真夏ノ夜ノ夢, Gekijōban Horikku: Manatsu no Yoru no Yume^?) premiered on August 20, 2005 alongside Tsubasa Chronicle the Movie: The Princess of the Birdcage Kingdom.^[1] The DVD version was released on November 24, 2006.

In the film, Yūko receives a request from a woman to help her back into her mansion, which does not allow her to enter.^[11] Yūko says that since Watanuki was the one who brought the client to her, he should be the one to grant her wish and therefore is brought along with her and Dōmeki. Yūko also attends because she has been invited to the mansion with many other famous collectors by the same letter, with the mansion filled with strange rooms and mysterious letters telling its guests what to do in place of a host.^[11] Though the collectors come to the theory of a mysterious auction being held, as in some urban legends, it becomes apparent that something more sinister and mysterious is going on as the collectors begin to disappear and a number of other strange occurrences happen.

The film was selected as a finalist for the Annecy International Animated Film Festival 2006 in the Feature Films category with other four nominees: Asterix and the Vikings, Origin: Spirits of the Past, Wallace and Gromit, and the award winner, Renaissance