Nightwalker may refer to:
Common uses A prostitute who works at night A person who sleepwalks at night A person who wanders at night which might alarm people; see Common law offence
Arts and entertainment Nightwalker (album), the 1981 album by Gino Vannelli Nightwalker: The Midnight Detective, an anime television series based on a video game The night form of the Shishigami (Spirit of the Forest), a character in Princess Mononoke
Folklore and mythology A translation of the Japanese Daidarabotchi, a giant in Japanese mythology A literal translation of many terms (such as Sanskrit tāmisra, niśācara, and kṣaṇada) for the rākṣasas, a class of Indian demons A synonym for vampire