The monograph is devoted to frequency-domain and root-domain methods of analysis and design of circulant and anticirculant control systems, which constitute an important class of multivariable [also called multi-input multi-output (MIMO)] feedback control systems widespread in various branches of industry and technology, such as process control and aerospace engineering, electrical power systems working in parallel and control systems of active vibration isolation, and many others. The salient distinctive feature of circulant and anticirculant control systems consists in their internal structural symmetry, which predetermines a number of remarkable dynamical characteristics of these systems essentially distinguishing them from all other classes of MIMO control systems. The monograph is intended for practitioners and researchers working in various areas of control engineering. It can also be helpful for lecturers on both classical and modern control, as well as for undergraduate and graduate students studying multivariable feedback control.