Victimisation (or victimization) is the state or process of being victimised or becoming a victim. The field that studies the process, rates, incidence, effects, and prevalence of victimisation is called victimology.

Peer victimisation is the experience among children of being a target of the aggressive behaviour of other children, who are not siblings and not necessarily age-mates. Peer victimisation is correlated with an increased risk of depression and decreased well-being in adulthood.

Secondary victimization (also known as post crime victimization or double victimization) refers to further victim-blaming from criminal justice authorities following a report of an original victimization.

The term revictimisation refers to a pattern wherein the victim of abuse and/or crime has a statistically higher tendency to be victimised again, either shortly thereafter or much later in adulthood in the case of abuse as a child. This latter pattern is particularly notable in cases of sexual abuse. While an exact percentage is almost impossible to obtain, samples from many studies suggest the rate of revictimisation for people with histories of sexual abuse is very high. The vulnerability to victimisation experienced as an adult is also not limited to sexual assault, and may include physical abuse as well.

Reasons as to why revictimisation occurs vary by event type, and some mechanisms are unknown. Revictimisation in the short term is often the result of risk factors that were already present, which were not changed or mitigated after the first victimisation; sometimes the victim cannot control these factors. Examples of these risk factors include living or working in dangerous areas, chaotic familial relations, having an aggressive temperament, drug or alcohol usage and unemployment. Revictimisation may be "facilitated, tolerated, and even produced by particular institutional contexts, illustrating how the risk of revictimization is not a characteristic of the individual, nor is it destiny."

Revictimisation of adults who were previously sexually abused as children is more complex. Multiple theories exist as to how this functions. Some scientists propose a maladaptive form of learning; the initial abuse teaches inappropriate beliefs and behaviours that persist into adulthood. The victim believes that abusive behaviour is "normal" and comes to expect, or feel they deserve it from others in the context of relationships, and thus may unconsciously seek out abusive partners or cling to abusive relationships. Another theory draws on the principle of learned helplessness. As children, they are put in situations that they have little to no hope of escaping, especially when the abuse comes from a caregiver. One theory goes that this state of being unable to fight back or flee the danger leaves the last primitive option: freeze, an offshoot of death-feigning.

Revictimization has also been characterized as a phenomenon whereby the children depicted in child pornography have a feeling of the depicted event reoccurring every single time the image is viewed. Each time the image is viewed, the children relive the experience as if it were happening all over again. As the images are viewed over and over again, this leaves the children feeling, or being as if they were, raped all over again.

In adulthood, the freeze response can remain, and some professionals have noted that victimisers sometimes seem to pick up subtle clues of this when choosing a victim. This behaviour can make the victim an easier target, as they sometimes make less effort to fight back or vocalise. Afterwards, they often make excuses and minimise what happened to them, sometimes never reporting the assault to the authorities.