Suicide is a major public health issue which is highly complex and multifaceted. Subsequently, after the pioneering work of Durkheim and Freud, researchers and scholars have attempted to explain the biological, social, and psychological nature of suicide. The present work presents an overview of different theoretical models underlying the development of suicidal behaviour. Hence the theory components will be a better understanding of the causal mechanisms of suicide and it will lead to improving the intervention strategies for suicidal behaviours.