First launched in 2005, the biennial International Conferences on Task-Based Language Teaching (TBLT) have become an established event for a broad range of participants, and a key feature of the conferences has been the invited plenary (keynote) addresses. This edited volume brings together a selection of plenaries given at conferences between 2015 and 2023, and exemplifies the contributions being made by prominent and internationally recognised TBLT scholars on a variety of issues pertinent to TBLT theory and practice. The volume is framed around how the horizon of TBLT has broadened over the past decade, and how the plenaries presented during this past decade have helped to take our knowledge and understanding of TBLT further. This volume will be of interest to a wide range of stakeholders, including teachers, researchers and postgraduate students, who would like to gain an overview of key dimensions of the field in the last decade.