We summarize outcomes from the 2021 KidRec Workshop, co-located with the ACM Interaction Design and Children conference. The theme of the 5 th edition of KidRec was Search and Recommendation Technology through the Lens of a Teacher. During the workshop, we discussed why teachers are one of the main stakeholders when designing information retrieval tools for the classroom and how to involve them as part of the research and development process to ensure that the resulting tools are suitable and supportive for learning. Date : 27 June, 2021. Website : https://kidrec.github.io/.