•Cognitive distortions are faulty, biased and irrational ways of thinking that mean we perceive ourselves, other people and/or the world in a way that does not match reality and is usually negative.•Therefore, a person’s perception of events is wrong, but they think it is accurate.•In the context of offending behaviour, such distortions allow an offender to deny (to reduce negative emotions) or rationalise (justify) their criminal behaviour.