Splenic artery aneurysm is the third most common location of intra-abdominal aneurysms. Giant splenic artery aneurysm is rarely seen and is at a high risk of rupture. Location and size of the splenic artery aneurysm determine the likelihood of rupture. A case of giant splenic artery aneurysm in a 35-year-old woman is reported. She presented with upper gastrointestinal bleeding. She had splenomegaly and extrahepatic hepatic portal hypertension. Angiography confirmed a giant splenic artery aneurysm measuring 8 × 10 centimeters, located in middle and distal two-thirds of the splenic artery. Surgical treatment in the form of in toto excision of aneurysm with splenectomy and devascularization was performed.