Abstract: A security shutter system for providing security against forced entry through a window. The security shutter system includes a securing frame being coupled to a wall of the structure around the window. A shutter frame is pivotally coupled to the securing frame and is selectively pivoted over the securing frame and secured to the securing frame over the window. The shutter frame is designed for inhibiting access into the structure through the window when the shutter frame is positioned over the window. A plurality of slat members are pivotally coupled to the shutter frame. Each of the slat members is selectively pivoted between a vertical orientation and a horizontal orientation. Each of the slat members controls light passage and visibility through the window.