Defamation is a communication that injures a third party's reputation and causes a legally redressable injury.

Defamation may also refer to:

Defamation (Dutch criminal law) Defamation Act, stock short title used for legislation in various countries relating to defamation Defamation (film), 2009 Israeli documentary film Defamation Act 2013, an act of the Parliament of the United Kingdom which changed English defamation law Unintentional defamation, where a work of fiction contains a character that coincidentally shares a name or other recognizable characteristics with a real person

See also Defamer (disambiguation) Anti-Defamation League (disambiguation) Defamation of religion and the United Nations United States defamation law English defamation law Defamation in Australia Canadian defamation law Anti-Defamation League, New York-based international advocacy organization with the purpose of combatting antisemitism Anti-Defamation Commission, a Jewish-Australian community to combat antisemitism in Australia Punjab Defamation Act 2024, piece of legislation passed by the Punjab Assembly in Pakistan Polish League Against Defamation, right-wing nationalist non-governmental organization based in Warsaw, Poland