ICCBR-2017, the 25th International Conference on Case-Based Reasoning, was held in Trondheim (Norway) in June 2017. The conference included 27 original contributions presented in oral sessions and in a poster session. In addition to three invited talks, the meeting also included workshops on CBR and Deep Learning, Computer Analogy, and Process-Oriented CBR, as well as a Doctoral Consortium, the Computer Cooking Contest, and the first CBR Video Competition.