Bullying a detrimental behavior associated with costs to individuals, schools, and communities. Essential to our efforts to reduce bullying is understanding why bullying occurs, particularly from the perspective of preservice teachers who will one day engage in antibullying intervention and prevention efforts. However, no such measure capturing the multi-faceted nature of bullying motives exists. The current study addressed this gap by developing and validating the measure "Perceived Motives for School-Based Bullying" (PMSBB) using a sample of preservice teachers (n = 331, 86.5% female) pursing their teaching degrees. Results of the confirmatory factor analysis (CFA) supported a 6-factor solution reflecting the following motives for bullying: (1) desire for social status, (2) peer group reasons, (3) peer influence, (4) recreation, (5) resource control, and (6) retaliation. Implications for the measure's usage as part of larger antibullying efforts are discussed.