Sliding mode control (SMC) has become popular in the field of nonlinear control since due to its desirable properties, such as robustness to uncertainties, parameter perturbation, and external disturbance, finite-time stabilisation, and fast convergence. For these reasons, SMC theory has been widely investigated in recent decades to deal with multiple complicated problems, including the time-delay problem, predefined-time output stabilisation, discontinuous integral action, and the input/output constraint problem, among others. Additionally, advanced SMC theory has also been applied to practical systems, such as electric vehicles, wheeled mobile robots, miniature helicopters, and permanent magnet synchronous motors.

In spite of the extensive and successful development of SMC approaches and techniques, their capability in handling discrete systems, higher-order systems, chattering problems, time-delay problems, and real implementations needs to be further strengthened. Meanwhile, with the high precision requirement of the industrial area, SMC techniques in industrial systems have already played an important role.

The purpose of this Special Issue is to highlight the latest theoretical and technological developments in relevant topics on SMC, providing a platform for researchers to display their new results in this area. Authors are invited to present their new methods on controller design, novel algorithms on SMC-based observers, and ideas on implementation and applications. Both original research and review articles are welcome, as are all related papers on theoretical methods and their applications for SMC of linear or nonlinear systems are welcome, and papers investigating newly emerging fields are especially welcome.

Potential topics include but are not limited to the following:

• Input/output constraint problems in SMC
• Higher-order sliding mode control
• Chattering-free sliding mode control theory
• Time-delay problems in SMC
• Sliding mode observation design
• Decentralised sliding mode control
• Implementation methods of sliding mode controllers