This book constitutes the refereed proceedings of the 27th ATEE Spring Conference onSocial Justice, Media and Technology, ATEE 2021, held in Florence, Italy, during October 28–30, 2021.The 19 full papers included in this book were carefully reviewed and selected from 49 submissions. They were organized in topical sections as follows: teaching critical media/digital literacy in multicultural societies; decommodifying teacher (digital) education; and digital technology and equity for inclusive teaching.