Recent research demonstrates the need to examine the concepts of moral injury and professional quality of life (compassion fatigue, compassion satisfaction, and burnout) in police officers. Building on these findings, the current study aims to determine the prevalence of these psychological concepts in a large municipal police department, as well as potential group differences in the prevalence of these concepts. Further, the study explores whether the psychological concepts of moral injury and compassion fatigue, also known as secondary traumatic stress, are associated within the sample of police officers. Finally, the study examined the potential of moral injury being a significant predictor of compassion fatigue (Papazoglou & Chopko, 2017). Initial Spearman’s correlation coefficient analyses found significant relationships between moral injury and compassion fatigue. Exploratory linear regression analyses determined that moral injury and burnout consistently predicted compassion fatigue, even while controlling for sex, education level, and years of experience.