• "Maniac" (song), by Michael Sembello from the 1983 film Flashdance
• MANIAC I, an early computer
• Maniac, a pac-man/hangman combination computer game designed to natively run on early PPC and 68K Apple Macintosh computers, as well as compatible clones running System 7.

Maniac may also be:

• A person who exhibits the behaviour known as mania
• A classification of serial killer
• Stage name of Norwegian musician Sven Erik Kristiansen
• Callsign of the fictional character Todd Marshall from the Wing Commander game series

See also:

• Maniac (film)