Visitor Q (ビジターＱ, Bijitā Kyū) is a 2001 Japanese erotic black comedy-horror film directed by Takashi Miike. It was filmed as the sixth and final part of the Love Cinema series consisting of six straight-to-video releases by independent filmmakers via a brief but exclusive run at the minuscule Shimokitazawa cinema in Tokyo. The six films were conceived as low budget exercises to explore the benefits afforded by the low-cost digital video medium such as the increased mobility of the camera and the low-lighting conditions available to the filmmakers.

Visitor Q often replicates the style of documentary footage and home movies, which invokes a sense of realism that contradicts the film's more bizarre elements and black comedy. The film's plot is often compared to Pier Paolo Pasolini's Teorema, in which a strange visitor to a wealthy family seduces the maid, the son, the mother, the daughter, and finally the father, before leaving a few days after, subsequently changing their lives.