Unguarded tricuspid valve orifice is a rare malformation. It is characterized by complete or partial agenesis of the tricuspid valvular and subvalvular apparatus. The complete absence of tricuspid valve structures is often associated with pulmonary atresia and intact ventricular septum. We report on two cases diagnosed as unguarded tricuspid valve orifice. These cases were presented because of unguarded tricuspid valve orifice is reported rare in the literature