Meckel's diverticulum is usually asymptomatic but occasionally presents with complications. Formation of an enterolith inside a Meckel's diverticulum is very uncommon and dislodgement of such a stone causing obstruction is extremely rare. We herein present a case of a 48-year-old man who presented with small bowel obstruction. Preoperative radiologic studies revealed a stone-like lesion in the right lower quadrant. Upon laparotomy, an inflamed Meckel's diverticulum was found as well as a 2.5 cm stone obstructing the terminal ileum. The stone was removed and the diverticulum was excised. The differential diagnosis of acute intestinal obstruction should include this extremely rare clinical entity especially when the combination of small bowel obstruction with radiopaque stone-like finding on preoperative x-rays is present.