Unnatural Acts can refer to
* Unnatural act, a form of sexual behavior that is considered a punishable offense by law
* Unnatural Acts (radio series), ''Unnatural Acts'' (radio series), a BBC radio comedy series
* Unnatural Acts (TV series), ''Unnatural Acts'' (TV series), a 1998 television sketch comedy series
* ''Unnatural Acts of Intercourse'', a working title of the Stephen King book ''Just After Sunset''
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