IEEE CTW 2021 - IEEE Communications Theory Workshop. The workshop is held every Spring and features invited talks on the latest research in communication theory from the world's leading researchers. The continued success of this workshop lies in its informal and highly interactive atmosphere, in contrast to more formal conferences. As always, the workshop will be single track with technical sessions, plenary speakers, panel discussions, and a hot-topics submitted poster session. The technical sessions will consist of invited lectures given by leaders in both academia and industry.