Funding Information: This workshop was supported by the IFIP Working Group 13.10 on Human-Centred Technology for Sustainability. For more information please visit: 4se.hs-augsburg.de/wg13-10/. Publisher Copyright: © 2022, IFIP International Federation for Information Processing. This paper presents the results of the workshop on Human-centred Technologies for Sustainable Development Goals (HCT4SDG) - Challenges and Opportunities. The workshop was part of the 18th International Conference promoted by the IFIP Technical Committee 13 on Human-Computer Interaction (Interact 2021). Nine papers were presented by authors from several different countries and discussed in the workshop. Six of these papers were extended in this proceedings. After discussion, seven challenges and eight research opportunities were listed as expression of the participants’ views on HCT4SDG.