The effects of fluid structure interaction in a fluid-filled cubic composite structure subjected to low velocity impact are the focus of this study. A fabrication technique was developed for creating an E-glass composite cubic structure and a pendulum was designed and built to provide a repeatable low velocity impact. The behavior of the composite structure was studied at various fluid fill levels and impact velocities. The fluid level inside the structure was varied incrementally from empty (0% fill) to full (100%fill). With impact load measurements, strain measurements on each side, and high-speed video, the behavior for each test case was analyzed and compared. Two types of baffles were designed and fabricated out of dense foam material. The behavior of the structure with and without a baffle was compared. The results showed the effect of fluid structure interaction in the composite was significant and varied with the fluid fill level. In addition, the effect of a baffle varied between the sides of the structure with the most notable effect being on the front and back sides. The baffle provided the greatest strain reduction at the high fill levels.