Ghost reflections are a major consideration in the optical design of the National Ignition Facility. The first-order layout (e.g., spacing between components), the lens shape, and the dimensions of the building are strongly affected. In this paper we will describe the principal ghost reflections that drive the system configuration. Several specific examples will be shown to illustrate how dangerous ghost reflections are avoided and stray light concerns are managed.© (1998) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.