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Background: The incidence of suicide attempts peaks during adolescence, with adolescent girls having a higher rate of attempts than boys. Depression is one of the main risk factors of suicidal behaviour and yet not all adolescents with suicidal ideation or attempting suicide have a diagnosable depressive disorder. The present study examined the unique contributions to suicidal ideation and attempting suicide of cognitive processes known to be associated with depression and anxiety, but which are also transdiagnostic: anomalous perception of reality, intolerance of uncertainty, and rumination. Method: 605 adolescents (M= 13.22, SD= 1.03, 47% girls) were evaluated in a cross-sectional study. Results: Multiple linear regression showed that the anomalous perception of reality and intolerance of uncertainty were uniquely associated with the severity of suicidal ideation, even when accounting for symptoms of depression and anxiety, but only amongst girls. In a logistic regression, self-reported depression symptoms, and not underlying cognitive processes, predicted the likelihood of a person having attempted suicide versus not having done so. Conclusions: In adolescent girls, less frequently evaluated transdiagnostic variables may have an important impact on suicidal ideation. However, depression symptoms, and not these transdiagnostic variables, seem to be the greatest contributor to attempting suicide. [ABSTRACT FROM AUTHOR]