A review protocol does not exist for the purposes of the present study. The search engines PsycINFO, Web of Science, and Ovid MEDLINE were searched using the terms bully*, teas*, victim*, mobbing, ragging, and harassment in combination with the term suic*. The search included articles published from January 1, 1910, to January 26, 2013. In addition to this literature search, review articles6,7 were searched for relevant publications. The reference lists of retrieved articles were scanned to identify articles for potential inclusion in the meta-analysis. Articles published in English, Spanish, German, French, Dutch, Portuguese, and Lithuanian were eligible for inclusion in the analysis. Studies from any country were eligible for inclusion. Our search was not limited to published articles; book chapters, dissertations, unpublished articles, and posters were also eligible. A flow diagram of our search results is provided in Figure 1. Studies on self-harm that did not include a measure on suicide were excluded, because it has been argued that self-harm is conceptually different from suicide, and reasons behind self-harm are different from reasons behind suicide.19 Only studies that focused on bullying by peers were included; thus, studies on other types of victimization (eg, assault, sexual abuse, and robbery) or by other perpetrators (eg, parents, teachers, and strangers) were excluded. Studies that included participants older than 21 years were excluded from the meta-analysis. Studies that focused on clinical samples10,20- 23 or samples of incarcerated youth24 were excluded from the meta-analysis to ensure that the obtained results could be generalized to a population in a usual setting.25 One longitudinal study26 was included because it provided an effect size in which both peer victimization and suicidal ideation were calculated at the first measurement. Five other studies27- 31 using retrospective and prospective designs were excluded. Retrospective and prospective designs are often evaluated separately in meta-analyses because they concern how peer victimization affects victims later in life,32 which is a different question from how peer victimization is immediately related to suicide. Several studies made use of the same data set (Dane County Youth, Global School Health Survey, Add Health, Linkages, and Youth Risk Behavior Survey). When studies used the same data set, we chose to code the study that used the full data set over those that used only a subsample. If multiple studies used the full data set, we chose the study from which an effect size was more easily retrieved. The studies included in the meta-analyses12- 15,17,18,26,33- 61 are summarized in the Supplement (eTable 1 and eTable 2). Some studies report only on suicidal ideation, others report only on suicide attempts, and some studies report on both measures. If studies reported on both suicidal ideation and suicide attempts, they were included in both meta-analyses. For the relationship between peer victimization and suicidal ideation, 34 studies met our inclusion criteria, with a total of 284 375 participants. For the relationship between peer victimization and suicide attempts, 9 studies met our inclusion criteria, with a total of 70 102 participants. Of the studies included in the meta-analysis on suicidal ideation, 1 article was written in Portuguese34 and 1 article was written in Lithuanian59; all other articles included were written in English.