This book constitutes the refereed proceedings of the 9th International Workshop on Learning Technology for Education Challenges, LTEC 2021, held in Kaohsiung, Taiwan, in July 2021. 
The 11 revised full papers and 6 short papers presented were carefully reviewed and selected from 83 submissions. The papers are organized in the following topical sections: learning tools and environment; e-learning and transferability strategies; serious games technologies; learning practices and knowledge transfer.