Editorial for Focus Issue on Optical 3D Display and ImagingWith the impressive progress of flat panel display technologies, the three-dimensional (3D) display and imaging technologies have attracted much attention in recent years as they can provide ultimate realistic views to us. Hence we designed a focus issue intended to introduce recent optical researches in this field, especially the works by some distinguished research groups.This focus issue includes twenty-two invited papers, review papers, and contributed papers from China, South Korea, Japan, USA, UK, Israel, and Russian. We have classified the papers into four topics: 3D Holographic Display, Auto-stereography and Virtual Reality, Digital Holography, and Computer-generated Holography. It is hoped that this issue will bring the research community's attention to some of the latest development in the area.We want to thank the Executive Editor-in-Chief, Prof. Changhe Zhou, for inviting us to serve as this focus issue editors and Ms. Yanfang Hu for her valuable help in ensuring the timely production of this focus issue.