Insomniac or The Insomniac may refer to:

• A person who has insomnia

• Insomniac (Green Day album), 1995
• Insomniac (Enrique Iglesias album), 2007
• "Insomniac" (song), a 1994 song by Echobelly
• "Insomniac", a song by Billy Pilgrim
• Insomniac, a record label founded by Poets of the Fall
• Insomniac (promoter), an American music tour promoter focusing primarily on electronic music events

• The Insomniac (2013 film), an American film directed by Monty Miranda
• Insomniac Games, an American video game developer
• Insomniac Press, a Canadian independent book publisher
• Insomniac with Dave Attell, a 2001–04 television series

• The Insomniax, an American songwriting/production duo
• Insomnia (disambiguation)