Abstract : Current guidance and control systems for interceptor missiles use algorithins that require knowledge of the target. These systems are not robust to target maneuvers and disturbances. In this paper, we investigate the use of a novel controller named a Sliding Mode Controller (SMC). We consider two types of interceptors or kinetic energy kill vehicles (KEKVs): a ballistic missile and a cruise missile. Sliding mode controllers are robust, simple guidance and control algorithms which can be applied to interceptors. After the interceptor flight path angle captures the line-of-sight angle, the SMC will follow the line-of-site angle regardless of external disturbances, plant uncertainties or measurement noise until the target missile is intercepted. The developed guidance and control algorithms require estimating or measuring only the interceptor missile flight path, line- of-sight angles and their derivatives. Estimation of the target position, velocity and acceleration is ot required. We have validated the effectiveness of the designed sliding mode controllers through numerical examples.