We invite academic researchers and professionals to participate in the 15th International Social Innovation Research Conference (ISIRC) in Guimarães, Portugal. The conference is being organized by the ALGORITMI Research Center and the Education Research Center at the University of Minho. It will take place at the School of Engineering of the University of Minho, in Guimarães, from September 6 to 8, 2023. Our main goal is to bring together academics and professionals from different fields with an interest in social innovation and social entrepreneurship. We hope to provide a forum for debate for researchers and professionals, supporting the sharing of experiences, promoting cross-knowledge, and strengthening knowledge about research in social innovation. You will also have the opportunity to visit Guimarães, a magnificent city of medieval origin known for being the birthplace of the Portuguese nation. You will be able to admire the remarkably well-preserved Historic District of Guimarães, classified by UNESCO as a World Heritage Site since 2001, while also getting in touch with popular traditions and savoring the famous cuisine of the Minho region. We hope to see you in Guimarães in September 2023!