Abstract: This study investigated the mediating effects of personality traits, sexism, and bystander attitudes toward sexual harassment (BASH) among female navy personnel in Taiwan. A cluster sampling method was used to recruit 281 participants, with data collected on age, sexism perceptions, and BASH via a structured questionnaire. Descriptive analyses, analysis of variance (ANOVA), and structural equation modeling (SEM) revealed that personnel aged 21 to 30 and with 1 to 4 years of service reported significantly lower sexism scores. Older personnel, officers, and personnel with more years of service had significantly higher BASH scores than their younger, lower-level, and less experienced counterparts. Agreeableness and openness personality traits and sexism can explain female BASH. SEM Results: indicated that openness was the strongest explainer of BASH (beta = .30), followed by age (beta = .18), with sexism perceptions fully mediating the relationship between agreeableness and openness traits and BASH. Instructional implications and recommendations are discussed.