En el siguiente trabajo se indagará sobre el problemático concepto de lo real en psicoanálisis, así como su dificultad para abordarlo. Sobre dicho término lacaniano, se opondrán las conceptualizaciones del psicoanalista J. A. Miller y el filósofo, sociólogo, dramaturgo y matemático Alain Badiou, para extraer conclusiones que cobren valor teórico, y por tanto clínico y ético. Palabras clave Real - Psicoanálisis - Lacan - Miller - Badiou ABSTRACT THE LOST REAL AND THE REAL FOR DE 21ST CENTURY: POINTS ABOUT THE WAYS OF CONCEIVING THE REAL IN PSYCHOANALYSIS In the following work we will investigate the problematic concept of the real in psychoanalysis, as well as its difficulty to approach it. On this lacanian term, the conceptualizations of the psychoanalyst J. A. Miller and the philosopher, sociologist, playwright and mathematician Alain Badiou will be opposed in order to draw conclusions that take on theoretical value, and therefore clinical and ethical. Key words Real - Psychoanalysis - Lacan - Miller - Badiou