List of manifestos of mass killers

This is a list of manifestos written by mass killers and attempted mass killers, explaining their motives for their actions. Many of them have committed the killings to propagate their views.

Analysis
According to a 2020 analysis of 17 mass shooters' manifestos, common themes appearing in them are: narcissism, threats to masculinity, paranoia, fame, suicide ideation, and revenge. A 2017 analysis found the following themes in the manifestos of mass murderers: ego survival and revenge; pseudocommando mindset: persecution, obliteration; envy; nihilism; entitlement; and heroic revenge fantasy.

The FBI conducted a study of 52 lone terrorists in 2019, which found that 96% produced either writings or videos intended to explain their beliefs to others; they found that in 88% of cases, perpetrators published their manifestos before the attack occurred, or "leakage," which is a valuable opportunity for intervention.