Background: Upper-extremity limb loss has been associated with serious psychological sequelae. Despite advancements in surgical procedures and prostheses for upper limb amputees, it is critical to recognize the psychosocial component of these patients’ care. Although the role of psychological factors in outcomes is increasingly acknowledged, little is known about the prevalence of depression and post-traumatic stress disorder (PTSD) in the civilian population after traumatic upper-extremity amputation. Methods: In this retrospective observational single-center study, adult patients evaluated for traumatic upper limb amputations from 2016 to 2019 completed the Disabilities of the Arm, Shoulder, and Hand (DASH) questionnaire, Visual Analogue Scale, the Center for Epidemiologic Studies Depression Scale, and the Primary Care PTSD Screen during visits. All data underwent descriptive statistical analysis. Results: Thirty-nine adult patients treated for upper-extremity traumatic amputation completed patient-reported outcomes (PROs) questionnaires. The median final follow-up time for our cohort was 17 months from amputation. Twenty patients (51%) screened positive for depression and 27 (69%) for PTSD during follow-up. The median time from amputation to first positive screening was 6.5 months for depression and 10 months for PTSD. The physical component score of Veterans RAND 12-Item Health Survey (VR-12) was significantly worse for patients with depression. The Median DASH and mental component score of VR-12 were significantly worse for patients with PTSD. Conclusion: Upper-extremity limb loss has a significant impact on mental health, which in turn affects PROs. The high prevalence of depression and PTSD in traumatic upper-extremity amputees underscores the necessity for screening and multidisciplinary treatment.