Insidious may refer to:
* Insidious (film), ''Insidious'' (film), a 2010 horror movie
** Insidious (film series), ''Insidious'' (film series), its franchise
* Insidious (soundtrack), ''Insidious'' (soundtrack), 2011 soundtrack album
* ''Insidious'', 2004 album by Mephisto Walz
* ''Insidious'', 2011 album by Nightrage
{{disambiguation