International Bystander Awareness Day is an annual observance held on 13 March that promotes public awareness of bystander intervention and encourages individuals to take safe, responsible action when witnessing harassment, hate crime, violence, or other harmful behaviour. The observance highlights the role of bystanders in preventing harm, supporting those at risk, and challenging abuse in public, educational, workplace and community settings.
The observance originated in the United Kingdom as National Bystander Awareness Day, before later expanding internationally.

Background
The principles underlying bystander awareness are rooted in social psychology research on the bystander effect, a term introduced by psychologists John M. Darley and Bibb Latané in the late 1960s. Their research demonstrated that individuals are statistically less likely to intervene in emergencies when others are present, a phenomenon commonly attributed to diffusion of responsibility, social influence, and uncertainty about appropriate action.
Public discussion of bystander behaviour intensified following the 1964 murder of Catherine “Kitty” Genovese in New York City. Early media coverage of the case, which reported that numerous witnesses failed to intervene, contributed to widespread debate about collective responsibility and public inaction. Although later investigations corrected aspects of the original reporting, the case remains influential in academic literature and public understanding of bystander behaviour.


Bystander effect
The bystander effect is a social psychological phenomenon in which individuals are less likely to offer help to a person in distress when other people are present. The likelihood of intervention typically decreases as the number of bystanders increases. The effect has been studied across a range of contexts, including emergencies, harassment, bullying, hate incidents and public safety situations.


National Bystander Awareness Day was established in the United Kingdom in 2019 by the community safety and anti-hate organisation Communities Inc. The initiative was developed in response to concerns around hate crime, harassment, and public safety, with a focus on increasing public confidence to recognise harmful behaviour and intervene safely.
Early observances in the UK centred on education, awareness-raising and the promotion of practical approaches to bystander intervention, including recognising risk, de-escalation, and reporting. Activities associated with the day included community engagement initiatives, training programmes and public-facing campaigns.

In 2023, the observance was expanded beyond the United Kingdom and re-launched as International Bystander Awareness Day, reflecting growing international interest in bystander intervention as a preventative approach to addressing hate, harassment and violence.

Observance
International Bystander Awareness Day is observed annually on 13 March. Activities associated with the day typically include public awareness campaigns, active bystander training, and initiatives focused on community safety, safeguarding and hate crime prevention.

In the United Kingdom, the day has been marked by public bodies and transport authorities through the promotion and funding of bystander intervention training. For example, Transport for London (TfL) has supported free active bystander training aimed at addressing harassment and hate incidents on public transport.

Aims
The stated aims of International Bystander Awareness Day include:
Increasing public understanding of the bystander effect
Encouraging safe and proportionate intervention
Reducing barriers to action, such as fear or uncertainty
Promoting reporting and support where direct intervention is not possible
Supporting shared responsibility for community safety
The observance is commonly associated with broader work on hate crime prevention, violence against women and girls, safeguarding, and public safety education.