Background and Objectives: Buprenorphine is commonly used to manage opioid use disorder; however, the literature describes its potential role in treating treatment-resistant depression. Methods: We present a patient with bipolar disorder and opioid use disorder, who presented status post-suicide attempt. Results: After initiating buprenorphine-naloxone, the patient reported rapid improvement in depressive symptoms, pain, and suicidal ideation. Discussion and Conclusions: This case demonstrates buprenorphineʼs antisuicidal and mood-stabilizing capabilities, potentially via antagonizing κ-opioid receptors as well as reinstating the balance between reward and antireward circuitry. Scientific Significance: This case highlights buprenorphinenaloxone as a treatment for both treatment-resistant depression and opioid use disorder, as well as buprenorphineʼs rapid antidepressant, analgesic, and antisuicidal effects.