This entry explores online continuing professional development for CALL showing this has been a topic of interest in the field for some time. While complete courses that focus on this topic tend still to be taught face-to-face, there have been other more informal developments in the field of online teaching and learning. Many online language teacher education courses do include a specific module in CALL, and these continue to be researched. There is also the growing interest in the use of teacher online communities that make use of various social media platforms to support professional development, which are currently under-researched.