The Seventeenth International Congress on Artificial Materials for Novel Wave Phenomena – Metamaterials 2023, will comprise a 4-day Conference (11–14 September), and a 2-day Doctoral School (15–16 September). Co-organized by the METAMORPHOSE VI AISBL (https://www.metamorphose-vi.org) and the Foundation for Research and Technology - Hellas (FORTH), this Congress follows the success of Metamaterials 2007-2022 and continues the traditions of the highly successful series of International Conferences on Complex Media and Metamaterials (Bianisotropics) and Rome International Workshops on Metamaterials and Special Materials for Electromagnetic Applications and Telecommunications. The Congress will provide a unique topical forum to share the latest results of the metamaterials research. It will bring together the engineering, physics, applied mathematics and material science communities working on artificial materials and their applications in electromagnetism/optics, acoustics/mechanics, transport, and multi-physics. The Congress will be on-site.