This book contains a selection of papers accepted for presentation and discussion at ROBOT2023, the Sixth Iberian Robotics Conference, held in the University of Coimbra, Coimbra, Portugal, during November 22nd-24th, 2023. ROBOT2023 is part of a series of conferences that are jointly organized by Sociedade Portuguesa de Robótica (SPR) / Portuguese Society for Robotics and by Sociedad Española para la Investigación y Desarrollo en Robótica (SEIDROB) / Spanish Society for Research and Development in Robotics. These conferences, now occurring with a yearly periodicity, provide a forum to roboticists mostly from Iberia, but also from other parts of the world, to present and discuss their research results, new developments, and applications in the field of Robotics. The volume 1 of this book contains 45 papers addressing fundamental aspects of mobile robotics and robot manipulation while volume 2 contains 45 papers covering the application of robotics in different domains and environments.