The interest shown by scientific Psychology about the study of human attitudes towards death has produced, in the last fifty years, a important number of empiric works and the parallel development of diverse assessment instruments. This paper describes the process of construction and the psychometric properties of the Death Anxiety, Death Depression, and Death Obsession scales. A review is also made of the main empiric discoveries derived of their use in the study of the relationships and correlations of human death attitudes with diverse existential variables. Finally, the validated Spanish forms of the three instruments are presented.