This volume contains the proceedings of the Third International Workshop on Hybrid Systems: Computation and Control (HSCC 2000), which was held on March 23-25, 2000, in Pittsburgh, Pennsylvania. The proceedings of the rst two workshops in this series were published by Springer-Verlag, in the Lecture Notes in Computer Science series, as volumes 1386 and 1569. The focus of the Hybrid Systems workshop series is on modeling, control, synthesis, design,...