Purpose: To analyse the levels of depression and its influence on the presence of suicide ideation among high-school students.
 Methods: cross-sectional, observational, and comparative study. The sample included 447 students who answered the following: the Beck Depression Inventory, the Beck Scale for Suicide Ideation, the Hamilton Scale for depression and a risk factor questionnaire elaborated ex professor. Statistical analysis included a description of variables, Pearson’s correlation coefficient, and multiple regression.
 Results: Sixty-six students (14.8%) presented with suicide risk and 29 had made a suicide attempt. Almost 34% of the students presented some level of depression according to the Hamilton Scale.
 Conclusions: There is a strong correlation between suicidal behaviours and depression. It is important to raise awareness of the early signs of depression as a risk factor that may potentiate the risk of a suicide attempt.