An aneurysm in the upper extremity is rarer than in the lower extremity, and a traumatic false aneurysm is very rare. We encountered two patients with a traumatic false aneurysm in the upper extremity. The first case developed from a posterior interosseous artery injury after an internal fixation using a plate and circumferential wiring for a comminuted fracture of the proximal shaft of radius associated with a dislocation of the left elbow joint. This patient was managed by excision of the false aneurysm, and ligation of the artery. The second case developed from a radial artery catheterization on the left wrist. This was managed by excision of the false aneurysm and an end-to-end anastomosis and resulted in the disappearance of the false aneurysm and a good vascular patency. We report two rare cases of traumatic false aneurysm in the upper extremity and a review of the literature.