BACKGROUNDWe report a rare case of large retroperitoneal mass arising from left adrenal gland which presented as incidentaloma on investigations was found to be giant encapsulated lipoma in the region of left adrenal gland. A 80 year old male was operated upon, the entire tumour measuring 30*25*12 cm was successfully excised into preserving all the surrounding vital structures including pancreas, stomach, kidneys, aorta and spleen. Intention of reporting this case is the rarity of occurrence of adrenal lipomas-ranging from 0.4%-4% of adrenal tumours-and the size of the tumours-by far the largest reported in literature.