False accusations (or groundless accusations or unfounded accusations or false allegations or false claims) can be in any of the following contexts:
When there is insufficient supporting evidence to determine whether an accusation is true or false, it is described as "unsubstantiated" or "unfounded". Accusations that are determined to be false based on corroborating evidence can be divided into three categories:
- An allegation that is completely false in that the events that were alleged did not occur;
- An allegation that describes events that did occur, but were perpetrated by an individual who is not accused, and in which the accused person is innocent.
- An allegation that is partially true and partially false, in that it mixes descriptions of events that actually happened with other events that did not occur.
A false allegation can occur as the result of intentional lying on the part of the accuser; or unintentionally, due to a confabulation, either arising spontaneously due to mental illness  or resulting from deliberate or accidental suggestive questioning, or faulty interviewing techniques. Researchers Poole and Lindsay suggested in 1997 applying separate labels to the two concepts, proposing the term "false allegations" be used specifically when the accuser is aware they are lying, and "false suspicions" for the wider range of false accusations in which suggestive questioning may have been involved.
When a person is suspected of a wrongdoing for which they are in fact responsible, "false accusation may be used to divert attention from one's own guilt". False accusation may also arise in part from the conduct of the accused, particularly where the accused engages in behaviors consistent with having committed the suspected wrongdoing, either unconsciously or for purposes of appearing guilty.
A false accusation of rape is the intentional reporting of a rape where no rape has occurred. It is difficult to assess the prevalence of false accusations because they are often conflated with non-prosecuted cases under the designation "unfounded." However, in the United States, the FBI Uniform Crime Report in 1996 and the United States Department of Justice in 1997 stated 8% of rape accusations in the United States were regarded as unfounded or false. Studies in other countries have reported their own rates at anywhere from 1.5% (Denmark) to 10% (Canada). Due to varying definitions of a "false accusation", the true percentage remains unknown.
A false allegation of child sexual abuse is an accusation that a person committed one or more acts of child sexual abuse when in reality there was no perpetration of abuse by the accused person as alleged. Such accusations can be brought by the victim, or by another person on the alleged victim's behalf. Studies of child abuse allegations suggest that the overall rate of false accusation is under 10%, as approximated based on multiple studies. Of the allegations determined to be false, only a small portion originated with the child, the studies showed; most false allegations originated with an adult bringing the accusations on behalf of a child, and of those, a large majority occurred in the context of divorce and child-custody battles.
Research by the Workplace Bullying Institute, suggests that "falsely accused someone of 'errors' not actually made" is the most common of all bullying tactics experienced, in 71 percent of cases.
Münchausen syndrome by proxy
The case has been made that diagnoses of Münchausen syndrome by proxy, that is harming someone else to get attention for yourself, are often false or highly questionable.
In 1999, Pathe, Mullen and Purcell wrote that popular interest in stalking was promoting false claims. In 2004, Sheridan and Blaauw said that they estimated that 11.5% of claims in a sample of 357 reported claims of stalking were false.
Rage by a narcissist is directed towards the person that they feel has slighted them. This rage impairs their cognition, therefore impairing their judgment. During the rage, they are prone to shouting, fact distortion and making groundless accusations.
Psychological projection can be established as a means of obtaining or justifying certain actions that would normally be found atrocious or heinous. This often means projecting false accusations, information, etc., onto an individual for the sole purpose of maintaining a self-created illusion.
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