Abstract Discrimination against women, injustices, and job insecurity are three issues in hotel outsourcing that have not been examined together. This study uses conservation of resource (COR) theory to investigate whether male and female internal staff have lower job insecurity when they perceive external peers’ fair treatment by management or when they perceive such treatment for themselves. Using a pen-and-paper survey, data were collected from 215 internal staff who worked side by side with external peers in 14 Spanish hotels. Results indicate that female internal staff reduce their job insecurity when observing acts of interpersonal justice towards external peers, and male internal staff reduce their job insecurity when perceiving themselves as recipients of acts of procedural justice. No results were found for internal staff who observed acts of distributive justice towards external peers. Findings suggest that job insecurity threatens outsourcing’s success unless different kinds of justice are managed according to gender.