<p>This study aimed to create and validate a school aggression scale in Spanish. For this, a first questionnaire was created, validated by 3 expert judges and corrected for assigned to 198 students of the last years of school in Bogotá, Colombia. The questionnaire was submitted to an exploratory and complementary analysis with 39 additional subjects for a total of 237 participants in the subsequent confirmatory analysis. The final questionnaire of 28 items showed good validity indices (α = 0.904, Ω = 0.914) and adequate adjustment indices (RMSEA of 0.047, TLI 0.924 and chi-square of adjustment of 508, p &lt;0.001). Four factors called physical aggression, social aggression, verbal aggression, and antisocial traits were obtained. A valid and useful instrument for measuring school aggression is then offered.</p>