Compassion fatigue is a phenomenon wherein employees in "helping professions" develop decreased capacity for empathy due to repeated/extended exposure to client trauma and suffering. In addition to negatively impacting relationships with their clientele, compassion fatigue may also be associated with decreased wellbeing for case managers. To evaluate this connection, I drew data from the Mental Health Provider Survey collected by Dr. Teresa Scheid. Using this data, I summarized the type of work done by case managers, and created a reliable measure of compassion fatigue using items in the dataset. I then validated the measure using already-present scales of emotional exhaustion and depersonalization. Finally, I used Pearson’s correlation to analyze the relationship between this measure of compassion fatigue and established measures related to wellbeing. The correlation performed as predicted, with compassion fatigue being positively correlated with emotional exhaustion and depersonalization, and negatively correlated with measures of wellbeing. All correlations were statistically significant. This thesis provides an example of a reliable and valid measure of compassion fatigue, and demonstrates the relationship compassion fatigue to mental health case manager wellbeing.