Metasurfaces (MSs), usually consisting of 2D arrays of subwavelength meta-atoms with spatially varying geometric parameters, have drawn considerable research interest over the last decades. MSs manipulate the waves by introducing strong light–matter interaction to produce abrupt phase changes, which are superior to conventional optical materials. This section will invite several world-renowned scientists to introduce their recent developments of multiplexing and multifunctional metasurfaces and their fundamental properties, design strategies, and applications.