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There exists little scientific production on autolytic behaviour in homeless people, despite the fact that it is one of the groups that is more at risk. The aim of this study is to determine the prevalence of previous attempted suicide and suicide risk and its connection with the main risk factors. In order to do so, central tendency and dispersion measures, correlations, contingence tables, and average comparison tables according to type of variable and normality were used. The Plutchik suicide-risk test was used in order to determine the risk of suicide, and specific tests for the main risk factors analysed. The main results show a 24.7% suicide rate and 45.2% (n = 66) displayed suicide risk. The main predictive factor of the risk of suicide was the daily consumption of alcohol (OR = 1.011, p less than .001), followed by being a woman (OR = 1.381, p = .021). It is necessary to design and apply suicide prevention strategies for this population.