Omental torsion means a partial or total rotation of omentum around its main axis, which is called primary or secondary, depending upon the presence or absence of another associated abdominal lesion. Due to the objective rareness and absence of a typical symptomatology, the diagnosis often is neither made, nor considered preoperatively. The Authors present three cases that they the opportunity to observe. They point out that, in case of laparotomy for acute painful symptomatology of the lower abdominal quadrants, one should not forget the inspection of greater omentum.