Willingness to help as one of the indicators of pro-social behavior is defined as the intent or desire of person to provide help to another person. Different individual and situational determinants affect the intention to help another person. Starting point of this research was the cognitive development theory, while the aim of the research was to examine the determinants of willingness to help victims of physical intimate partner violence among young people within individual and situational features. The vignette method (n = 4) was used, varying with the gender of the perpetrator and victim of intimate partner violence. The web survey was conducted on a sample of 479 students at the University of Zagreb. Results of the research have shown that observers highest level of willingness to help show in a situation where a woman is a victim and in a situation of violence in a female same-sex relationship. The correlation between willingness to help and attitudes towards lesbians and gays has been confirmed. Results point to the need of public awareness and removal of certain stereotypes about intimate partner violence, apropos differences evidently occurring between men and women in the role of victim of physical intimate partner violence. More effort should be done on the equality of rights in same-sex relationships and awareness of their needs with the aim of removing the prejudices against lesbians and gays.