This is the first report of a patient presenting with a splenic pseudocyst following laparoscopic sleeve gastrectomy (LSG). A 26-year-old male with no chronic medical illnesses who underwent LSG presented with vague abdominal pain. An abdominal contrast-enhanced computed tomography revealed a 15 cm well-circumscribed cyst originating from the spleen. Intraoperatively, the findings were significant for a superficial cyst located at the lower pole of the spleen. A laparoscopic spleen-preserving procedure was conducted, specifically marsupialization and packing with omentum. The postoperative period was uneventful, and the patient was discharged on Day 2 postoperatively. The patient was free from complaints at outpatient follow-up clinics. Follow-up visits at the outpatient clinic were free from complaints. Pathology confirmed a splenic pseudocyst, and cytology was unremarkable. Since dissection during LSG is close to the spleen, infarction could occur, predisposing to pseudocyst formation. Marsupialization is an excellent surgical option when applied to appropriate splenic cyst types.