Our study compared the effects of mindfulness and relaxation interventions on stress, quality of life, resilience, and mindfulness levels. A total of 29 workers, recruited at a university hospital in the northeastern region of Brazil and distributed in two groups: Mindfulness (89.5% female, age mean 37.5 ± 6.23 years old); and Relaxation (90.0% female, age mean 34.2 ± 8.66). After eight weeks of daily mindfulness or relaxation practices, both groups significantly reduced the perceived stress and stress at work, and increased their mindfulness and resilience levels, as well as the physical and psychological quality of life domains. Our results suggest that both interventions may be effective in the organizational environment, assisting in health promotion and increasing the ability of individuals to recover from an adversity (resilience).