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Purpose: Early pubertal onset may relate to more involvement in bullying in adolescent girls, both as a target and as a perpetrator. However, the few studies of the association between early menarche and school bullying have shown mixed findings. The present study examined whether early menarche is associated with bullying victimization and perpetration., Methods: We obtained survey data on adolescent girls from the 2001-2002, 2005-2006, and 2009-2010 cycles of the Health Behaviour in School-aged Children study in 35 European and North American countries. We identified school bullying in the past 2 months using the Revised Olweus Bully/Victim Questionnaire. We defined early menarche as a reported onset of menarche before 11 years and tested the associations between early menarche and bullying victimization and perpetration using three-level logistic regression models., Results: The sample included 227,443 adolescent girls with a mean age of 13.64 (standard deviation [SD] 1.63) years, of which 10,172 (4.47%) were early matured; 62,528 (28.33%) and 56,582 (25.67%) were occasional victims and perpetrators, respectively; and 21,985 (9.96%) and 14,115 (6.40%) were frequent victims and perpetrators, respectively. Early menarche related to occasional victimization (adjusted odds ratio [OR] [95% confidence interval [CI] = 1.21 [1.12-1.31]) and perpetration (aOR [95% CI] = 1.19 [1.11-1.27]) and to frequent victimization (aOR [95% CI] = 1.35 [1.22-1.50]) and perpetration (aOR [95% CI] = 1.46 [1.31-1.63])., Conclusions: Early menarche in European and North American adolescent girls positively relates to bullying victimization and perpetration. Early-maturing girls should not be neglected in antibullying programs., (Copyright © 2018 The Society for Adolescent Health and Medicine. Published by Elsevier Inc. All rights reserved.)