Unnatural Causes may refer to:

• Manner of death (unnatural causes)
• Unnatural Causes (detective novel), 1967 detective novel by P. D. James.
• Unnatural Causes (1986 film), American television film
• Unnatural Causes (1993 film), British television film
• Unnatural Causes (TV series), 1986 British television anthology series
• Unnatural Causes: Is Inequality Making Us Sick?, 2008 American documentary
• Clean Break (film), 2008 American film released in Europe as Unnatural Causes
• Unnatural Causes, a song by Dublin Death Patrol from DDP 4 Life