El bullying es una agresión intencional, repetida y con un desbalance de fuerza física y/o mental. El bullying ha sido muy investigado en las instituciones escolares. Sin embargo, en otras instituciones, como las unidades penitenciarias, ha sido escasamente evaluado (Ireland, 2015). Mucho menos se ha estudiado en mujeres adultas privadas de la libertad (Loucks, 2015). El presente trabajo trató de evaluar los niveles de victimización y perpetración del bullying y su relación con la personalidad oscura. Se constituyó una muestra con 68 mujeres adultas que se encontraban privadas de la libertad en la Unidad Penal Número 6 de Paraná, Entre Ríos (edad media=38,7 años). Los participantes contestaron el Direct and Indirect Prisoner Behaviour (Ireland, 2002) y el Dirty Dozen de Jonason y Webster (2010). Un 14% era espectador; un, 44% víctima, un 4%, agresor y el resto era del grupo ambos (víctimas-perpetradores). La forma más frecuente de ser victimizado era la relacional (por ejemplo, esparcir rumores). Todas las dimensiones de perpetrar bullying se asociaban con maquiavelismo, psicopatía y narcisismo (rs= 0,33-0,72). Estos resultados indican que el bullying presenta una gran frecuencia en las mujeres privadas de la libertad, mientras que la personalidad oscura se asocia con su perpetración. Palabras clave Bullying - Personalidad oscura - Mujeres - Privación de libertad ABSTRACT BULLYING AND DARK PERSONALITY IN ADULT WOMEN DEPRIVED OF FREEDOM Bullying is an intentional, repeated aggression, and with an imbalance of physical or mental power. Bullying has been widely investigated in school institutions. However, in other institutions, such as penitentiary units, it has been scantly evaluated (Ireland, 2015). Much less has been studied in adult women deprived of liberty (Loucks, 2015). The present research aimed to evaluate the levels of victimization and perpetration of bullying and their relationship with the dark personality. A sample of 64 adult women who were deprived of liberty in the Penal Unit Number 6 of Paraná, Entre Ríos, was made up (mean age = 38.2 years). Participants answered the Direct and Indirect Prisoner Behavior (Ireland, 2002) and the Dirty Dozen by Jonason and Webster (2010). A 14% was a non-involved; 44% was victim, 4% was aggressor, and the rest belonged to the group both (victim-aggressor). The most frequent way of being victimized was relational (for example, spreading rumors). All dimensions of perpetrating bullying were associated with Machiavellianism, psychopathy, and narcissism (rs = 0.33-0.72). These results indicate that bullying is very frequent in women deprived of liberty, while the dark personality is associated with its perpetration. Keywords Bullying - Dark personality - Women - Deprived of freedom