To analyze the potential association between social support, experiences of violence, and sociodemographic characteristics of adolescents and the likelihood of acceptance of violence and machismo in different European countries. Methods: Cross-sectional design. We recruited 1,555 participants ages 13e16 from secondary schools in Alicante (Spain), Rome (Italy), Iasi (Romania), Matosinhos (Portugal), Poznan (Poland), and Cardiff (UK). We used linear regression models to identify how social support from teachers and parents, experiences of violenceddating violence, bullying, cyberbullying, abuse in childhooddand sociodemographic characteristics were associated with violent thinking, specifically: machismo and acceptance of violence. The analysis was stratified by sex. Results: Acceptance of violence was higher for those who had lower perceived social support from parents (b girls ¼ À154, p < .001; b boys ¼ À.114, p ¼ .019) for both sexes. Perpetration of bullying and/or cyberbullying was associated with higher scores for machismo and acceptance of violence for both sexes (b girls ¼ .067, p ¼ .035; b boys ¼ .225, p < .001; (b girls ¼ .118, p < .001; b boys ¼ .210, p < .001).Being the victim of dating violence, having suffered physical and/or sexual abuse in childhood, and lower perceived social support from teachers were associated with higher scores for both machismo and acceptance of violence. These associations differed between girls and boys. Conclusions: Machismo and acceptance of violence are widely present amongst adolescents in different European countries. Our results suggest the importance of providing educational/