Join us online at the 9th International Workshop on OpenCL, including SYCLcon 2021, for four days of talks April 26-29,2021. There will be workshops and community networking aimed at furthering the collaboration and knowledge sharing amongst the international community of high-performance computing specialist working with OpenCL, SYCL, SPIR and Vulkan Compute. The event provides a rich mix of hands-on tutorials, technical presentations, research papers, posters, panel discussions, networking and vendor discussions. It also provides a formal channel for community feedback to the Khronos Group, the industry body responsible for the standards.